I also miss my Mum. My daughter got engaged on 1st January (the first of her grandchildren to get engaged) and I know just how pleased and excited she would have been about it, now she doesn't even know she has grandchildren. Its heartbreaking.
I hate the fact that I can no longer ask my mum for advice, go shopping with her or just natter to her on the phone about nothing in particular,
To answer how do you cope with missing somebody who is still there, I mourn the mum I have lost but hug the Mum I still have and tell her I love her, knowing that one day soon (mum in carehome with last stage of vascular dementia) that I will also lose this.
That's it, it's that chatting on the phone about anything and everything I miss. Yesterday however I thought I would try and tell her something and I told her about a date is been on that I didn't enjoy. I just told her in simple sentences and she kind if understood and said "oh no I don't like the sound of him" it was funny because the lady sitting next to her is 103 years old. She's fab and she wanted all the details. I loved talking to them about it. I think they enjoyed a girly chat too. My mum can sometimes follow a story but sometimes she can't remember how it started. I say "oh it doesn't matter" she always says "please tell me again" if she just looks vacant I just leave it. It was great hugging her yesterday. I needed it.