I have no hatred towards DIL. She is from a family background where nobody had a will, they all lived off benefits in council housing and her DP made no provisions for her future. DH used to say people who live like that send their DC out looking for a cushy number.
If her family haven't provided for her, why should we take their responsibility
This gets worse and worse. I am certain you have posted about this before and presumably you are back to see if you can get a different answer, ie that you and your ghastly, grasping daughter are right. You should be ashamed of yourself, but I don't suppose you are. As for your daughter, I have no words, well no polite ones anyway.
As you don't like the replies you are getting suggesting you see a solicitor without your daughter present, and that you are being desperately unfair, then why are you here? My opinion won't change, and I suspect nobody else's will either. You don't deserve your son and his family.