My mum was an only child, born in 1920s. I'm a 50s baby. Her mum was a bitter woman, the money was spent on her brother's education, though she was clearly much smarter than him. I was her 1st grandchild, and she adored me and I her. I think that possibly created a rift between me and my mum.
My mother and her MiL had little to do with each other, they went through the motions when they did meet. Dad would visit his parents after work every week, and ring every day. We'd be taken over to see them in the holidays, mum would never come. Mum's family were middle-class, owned their own suburban semi. Dad's family were skilled working-class and lived in the same rented 2up 2down in South London for 40 years. My gran never criticised my mum ever to the best of my knowledge.
Wicked Little Letters? (funny film of a long-forgotten case)