Find this attitude staggering.
I’ve been a SAHM for 18 years due to my DH’s work commitments requiring extensive travel (up to 3 weeks), no local family to help, and both my kids being on the spectrum and/or having ADHD etc.
I’ve homeschooled and, through extension/loft conversion/interior design, have helped to increase the value of our main asset, our home.
My husband utterly respects and recognises my contribution and the sacrifices (a return to a well paid career) that I’ve made to facilitate his career, make his home beautiful, and in protecting and supporting our kids.
Fortunately his parents also recognise this and have never asked for a repayment of the deposit they gave us 20 years ago or asked for it to be specifically set aside for the GCs in the event of DH’s death so that I don’t get my grubby hands on it.
When we fostered 2 boys for 4 years (6-10 weeks a year and 3 nights a week during termtime), they didn’t have a wobble that someone else’s kids were benefitting from their ‘investment’, even when one of the extensions was to give them their own rooms when they stayed.
I don’t really care whether the PiLs are old fashioned, italian catholics. I was adopted into a high status muslim family when my unmarried British mother married the eldest son. Culturally I should have been a pariah, but they have shown nothing but love and acceptance for both me and my children (who love being the only blond, blue eyed grand kids receiving their money envelope at Eid from the Crumblies 🤣).
Sorry, long post, but I trully think the OP’s PiLs are despicable and feel deeply sorry for her DH to have his family treated this way.