She is fab.
I have warmer relationship with her than I do with my own mother. I can talk to her about pretty much anything.
She will pick the boys up from school at a moment's notice (she is self-employed) and hassles to babysit.
She buys lovely clothes for the boys (and me!) and will also buy school shoes/PJs and other necessary stuff if I ask.
FIL takes the boys for haircuts, which is something we struggle to find the time to do. AND they have offered to take us all away for a holiday later in the summer.
So. Either she is trying to take over my family or she's lovely.