When dp left his exw three years ago her already existing mental health problems spiralled out of control and she had a series of breakdowns. She is now on a more even keel but things might change again.
In all this time dp's widowed mother has supported the exw. She regularly visits the children at exw's house, she's provided childcare for exw, they've been out for meals with the kids and they've even been on overnight visits/holidays to dp's relatives who live further away.
Dp is getting increasingly annoyed with his mother about this, but I'm torn - exw has no family left and if it wasn't for dp's mother she would never get the chance to go on holiday for example, and dp's mother helping her tgrough her breakdowns meant dp couldcarry on as normal, with the children being cared for by dp's mother.
I'm not sure who's right in this?