Just a slightly different perspective here; my mother made many mistakes bringing up her children - she even left us for a couple of years when we were very young; but she has been a wonderful nana and the grandchildren she lives near to absolutely adore her.
I know that I have grown, developed and changed enormously over the years; my younger self would not recognise me. If your ex has changed then he might build some welcome bridges - and if he hasn't, then your daughter will know first-hand and not be left wondering what if.....?
Water Pollution -“ A National Disgrace”? A case for renationalisation?
Things you find stressful that other people don't notice.