I was married to an Asian man. My mother hated him even though he was a good son in law to her.
She preferred my siblings children to mine.
She never offered to help once during their childhood. She never came to school to watch a performance, she never babysat, she never came to my home.
When my son was 3 and went into hospital to be circumcised after his pre school check, I asked her to look after my daughter for the day and she said NO. My husband had to take the day off work so it was no biggie. It would have been helpful is all as she was not doing anything else.
When my son was 7 and had his tonsils removed she begrudgingly looked after the two younger ones overnight (another had been born by then) and they still remember how horrible she was to this day.
What a funny odd woman.
She looked after my sisters children like they were a precious thing, and we all knew, which was the embarrassing thing.
She told my Aunties that my sister's children were her best boys.
My Aunties were horrified and one of them told me. hey - I already knew anyway!
I look after my grandson regularly because I want to not because I want to make a difference. I love him probably more than I do my own children 
We certainly get along better - that's until I have had as much as I can stand of Turtles or Sponge bob. There is only so much a girl can take you know 
Point is... you have to stand back and try not to interfere in any way or you will surely get the blame.
In my case I feel my mother as a grandmother abused me by being so awful about my children, I am sure as hell not going to rock the family boat by saying anything.
Why not offer to have the grandchildren to stay? Just don't do it too often !
The King's Speech To Announce 'All But The End Of Leasehold System' System'


I do a fair amount of childcare for them both but I choose to do it so I do not need nor expect to be part of their family time. I am invited to parties, school concerts etc. and DD2 has hosted Christmas a couple of times. (DD1s house not big enough!) Seeing them all 2 x week plus sometimes at weekends is plenty!