This also happened in our family but in reverse. It was my daughter and two GC who did the suffering over the years. SiL never did a thing for her or the children, didn't do a thing in the house and when my D took over the mortgage in 2016 after handing over half the value, her half went towards double-glazed windows ( of which there weren't any ) re-building a fireplace, skips, and the general worry of working until she's 70 !
GS fortunately still lives at home and GD is a single mother with children living elsewhere.
EX-SiL was already living with one of his g/friends.He's now in hospital having heart surgery following a heart attack 2 weeks ago. Karma ? You bet !
Sorry if this sounds harsh on my part but my D and GC went through the mill over the years and it affected all of them. So now it's his turn for a taster of how they all felt.
I hide my thoughts/feelings from my GC, who are now in their 30's.