I sympathise with you a lot. I'm one of four children, or I was. My younger sister died in 2015, but she, me and my mum were very close, and I know she would've had no problems helping me out with Mum's alzheimers.
I also have two older brothers - there's a bit of an age gap between my brothers and me (we're all full blooded siblings). My eldest brother is out of the picture - his choice. He's been difficult to deal with for decades and I believe is quite toxic. He (like the poster's brother) is well off, kids at boarding school etc. But he just doesn't want to know - there's been no communication or gifts for close to ten years now, I thought my sister's death might have given him some common decency towards our mum, but no. He's a choatic person who gas-lights people (especially me) when he's around so frankly, I don't mind not seeing him. However in the last year or so he's been in contact with my brother and knows about mum. He's been sniffing around asking questions about mum's will, power of attourney. Him and his wife are very money orientated so I have to wonder...
My older brother is completely different. He helps out a *lot*, calls me daily etc but he lives almost an hour away from me, and I was mum's live in carer until she was sectioned (she has just been released and will go into a nursing home that has a space for her when she's recovered from her pneuomnia). I think until you're in the situation of being someone's offical or unoffical carer, it's very difficult to explain and even imagine. I can tell him about mum not eating, or being up all night - and worries about delussions and half a billion things but it's not the same as living.
My mum's currently in hospital having been sectioned two months ago but thank GOD she's finally been accepted by a nursing home - problem is she's managed to get pneumonia! I thought when she went into hospital it would be a break, and it has been, but there is so much work still - constant phone calls, health updates, finding nursing homes, not to mention fixing the house because she and my stepdad let it fall apart - and it wasn't until mum was in hospital that I noticed now bad the house had got. But that's all on my shoulders. My stepdad can't help (and wouldn't if he could) due to his own mobility and memory problems.
I'm lucky I have support from my brother but it still feels very lonely and exhausting because I'm the one everyone has to talk to - I lived with her, I know her symtoms. So I get the calls about her latest fall, or virus. I'm also a bit hampered because I can't drive (blaiming my dyspraxia and ADHD on that!)
So there's stuff he doesn't fully understand about the daily grind of caring, how mentally and physically exhausting it is. He also is keen for people to get on - including my eldest brother. He's not naive about my eldest brother's bad - and frankly toxic behaviour, but he worries I'll regret it. Unlikely. I have no desire to 'get on' with my eldest brother. For years I looked up to him before he decided our family was 'too stressful' - this from a man who reguarly threatened to kill himself due to his depression, 'functioning' alcholism and mental health issues.
I don't think there was really any discussion about me becoming mum's carer. I was living at home - always have - due to mum's mental health (long/chronic depression) and physical (cancer). I think it's almost envitable one sibling ends up the primary carer, even if all the siblings are very involved in their parents care.
I'm kind of glad my eldest brother isn't involved, because he's a self proclaimed expert on everything and if there is something he doesn't know either his wife or MIL are experts. Except on human decency and compassion. Your questions are interesting and very thought provoking.
I think a lot depends on the family structure, parent, relationships etc. Odds are any sibling that's a jerk as a kid may be the same as an adult. Yes people can mature and can change but only if they are willing to. I think to an extent (and I hate to say this) it starts with parents. At least to a degree.
Yes there are a *lot* of things at play: genetics, brain chemistry, age order, parents history/mental health/state of marriage, environment, mental health, culture...I could go on and on. But If a parent makes excuses and justifications for someone being **** - odds are they'll continue. I think it partly is to do with gender (please don't hate me for this) but most of the women I know end up caring for relations/friends/neighbors because it's expected. Women are considered care-givers, nurturers, reguardless if that's what they want. I just want to add I do know plenty of amazing men who are devoted carers too, but I think a lot of things sort of fall into women's laps because of assumptions of gender.
When one sibling picks up most of the slack it can allow other siblings to take a step back. They know mum/dad is being cared for, so they don't need to worry. For some it's out of sight, out of mind, they might be caring but unaware of the realities. One thing that's always puzzled me and actually angered me, was when I ended up caring for mum full time, I read a lot as I love researching and I kept coming back to how 'rewarding' caring was. To be honest, I never saw that, never felt it. I did it because I love my mum. We have always been close. I do it because I need to. Because it's expected of me. Because I live here and I can't ignore stuff.
One other issue could be - and I'm not excusing absentee siblings - but their perception of relationships. I don't mean in cases where there is abuse/neglect/bullying - because I think we can all understand a sibling not wanting to get involved if that was the case, but how they view relationships - both past and present.
For example, my eldest brother has a 'narrative' about his childhood, his relationship to mum, to us that is vastly different from what he remembers. He uses this narrative to justify cutting ties. I was a 'rainbow' baby - my mum lost a boy two years prior to me and had miscarriages so my brother thinks I was favored and spoiled. Maybe I was. But I was always the one to look after mum physically and emotionally from when I was quite young.
Does the sibling believe one was favored over the other etc. Perception is key, in interpersonal relationships and how we think about ourselves within a relationship. I think your relationship with your sibling(s) growing up can often set the tone for the future - especially disputes and how they were handled. Was a parent more leanient to one child consciously or sub-consciously etc. Was someone the 'baby', does gender play a factor, is there a culture/socialial pressures involved in caring etc. There are so many things at play.
Some people just can't and won't see it as 'their' responsibility. They get away with it because other people pick up the slack. Siblings - myself included tend to revert back to our childhood patterns of how we deal with siblings. Me, I hate conflict, would avoid it no matter how unhappy someone - including sibling behavoiour made me. I was a homebody, an introvert and never had Grand Plans etc so I think that set the tone -I stayed home and gradually ended up caring for my mum for over the past decade. My sister's death shattered a lot of assumptions I had about my family, my life and my eldest brother - that's when I lost faith in him. Not for myself, but that he still wouldn't talk to mum or bring his kids to see her. My sister was my best friend - but growing up when kind of hated each other. But we always had a clear sense of working together to look after mum.
I think our personalities as children do inform us as adults too. My elder brother he's always been chilled, kind and supportive - and that's how he's largely remained. My eldest brother was a born aggitator - he craved attension and conflict. He was a nightmare child (apprantly) and constantly in trouble. He's changed somewhat - he's become very right wing - but when it comes to our relationships - there's still that spark, he loves to play mind games, gas light - that's never gone.
Sorry for the long rambling post, it was a very interesting post and I'm curious what other poeple think. I do sympathize a lot with you over your brother and I completely understand your frustration that your mum enables and excuses his behaviour. I can't tell you know many people I know who have the same issue.
Weirdly my stepbrother is similar to your brother - so I'm not close to my stepdad - he's not a warm person and has been deceptive (and is) about finances. But because he lives with me I end up looking after him to a degree. His daughter is a bit involved but they have a bit of a distant relationship (he never rings his daughter). Now his son is the golden child - however he never calls about my stepdad, offers any help. He lives some distance away but is comfortably off, his wife doesn't work, they have one child who's almost a teen. I think because I'm here there's an assumption I'll sort things out. That's a nice theory but until recently I was mum's full time carer - I just didn't have time.
I think assumption is another key element. People assume that someone else will help. THat's what their sibling is there for (I imagine that's the case with your brother perhaps?) That they are closer (logistically or emotionally), that they aren't needed - or frankly they don't want the hastle. They justify that they have enough going on in their life. Some people jsut don't care, they will put their parent somewhere and forget. They don't feel they 'owe' their parent or siblings anything - especially if they'd never been made to take responsibility or they are just let off. It's always someone else's job because usually someone else (ie one of us) will take responsibility out of love, duty, responsibility, guilt, necessity, compassion, and a whole range of things.
Guilt's another primal motivator (big guiltor here!) if I *don't* do things, I feel horribly guilty. I know quite a few siblings who will pray on that too in a very unfair way - or ones that will pass judgement on your 'caring' but won't lift a finger to help and often we allow it. we don't tell the hospitals, care homes, social workers etc to our sibling because it's easier to do it ourselves, we are conditioned that it's our duty and responsibility. I sometimes wonder what would happen if we made neglectful siblings involved - obviously not talking about the amazing, supportive ones!