Hello
@Fmarg
I am sorry that your husband has become depressed about family members who passed away a long time ago yet does not remember your eldest son. This must be very difficult for you.
It’s hard to be certain why this is happening, but often people with dementia lose more recent memories first. They may still have memories from longer ago. As a result they seem to “time shift” into the past. Your husband may be experiencing sadness from events of 30 years ago as if they happened very recently.
My mum sometimes gets very tearful about people who passed away 60 -70 years ago. Old photographs can sometimes act as a trigger. It’s difficult as she really likes looking at the old photos, but in a moment she can become quite upset. Thankfully I can usually comfort her and then move her thoughts onto something else.
Sending you my thoughts and best wishes.