I always think the more people who love and support your children the better,
I have a friend who a few years after splitting with her DH, Had moved because of work to another county, bumped into the MiL that she had never met in her ten year marriage, they were on a samaritans course together,Mil was teaching, and got chatting, realised they were related, went into shock, took the next stage slowly,
MiL had been pushed out family by her MiL, when she suffered terrible PND after the death of prem twins, her husband never allowed her to see her other children, they were told she abandoned them, father re married and step mum never bonded with children, so their childhood was difficult.
she a massive part of my friend's family life much to the annoyance of her exH, the children love their grandma, who is enjoying family life for first time,she has made a massive difference to friend's life who mum died years ago, and father lives on the other side of planet,
there is always two sides to every story, and somewhere in the middle is the truth,
it's never fair for the next generation to miss out because of something that happened to others.