This is an interesting thread for me just now.
At this moment I am in a large family crisis because of my DIL's mother causing loads of trouble because of my son and his wife who are splitting up.
I n the majority of cases it seems that the mothers of sons have to take second place when grandchildren arrive.
My scenario is the opposite.I have two sons, no daughters.My DS1 is single with no children, DS2 has been married twice, he has three children from first marriage and two from his second.His first MIL and I had no problems, we had equal share of seeing our mutual grandchildren and when this marriage broke up other grandma never caused any problems.
His second MIL is a different story. DS2, his second wife and their children have lived with me and DH since birth of their first child a boy now 13.Their daughter is 11. Reason being they could not afford a house.They were both working at low paid jobs and I provided the childcare, her mother was just not interested.She and her partner once collected DGS from nursery then never again as her partner did not like driving in heavy traffic!.
My son is no angel, he is now unemployed, content to let his wife work part time and now things have come to a head over his unemployment and she told him she was leaving.
At first she was going into temporary accomodation and leave the children here with their father until council allocated a house all well and good.No offer from her mother to take she and the children in.
Then she and DS had some shouting match and she left saying she was staying a friend's. Then her mother came onto the phone and demanded the children be removed from their awful father and she was taking them and the children in.She turned up in the street made alot of shouting and put the children into the car. Later I found she had taken them and DIL to her other daughter's.Later that day DIL found temporary accomodation with the children and now her mother is accusing my son of putting his wife and children onto the street!.
The children seem happy which is the main thing, they visit my son and DH and I dailythe place they are living in is clean and modern-council owned.She has promise of a house soon.
I wish they were back together might happen when DIL gets a house but my DS needs to pull his socks up.I have spoken to him about this crisis and feel he is to blame, but the actions of his MIL are beyond words.The children would still be here had she not stuck her oar in.I would not mind at all if they had gone to her house but feel pigs would fly sooner.
It goes without saying that the other grandmother and I are no longer on speaking terms. Marriage breakups involving children are horrible