What a mess. I am surprised your DS and DiL have hung around for so long to be honest, you have stood by and allowed them to be excluded and treated very unfairly by your vile, greedy DH and equally vile DD. So, your DD has had 2 houses bought for her using your inheritance, and your DS is begrudged a few weeks staying with you while they save the deposit for a rental? Sorry, your passivity, your unwillingnes to rock the boat caused this. Go and see your DS, tell him what you have told GN, it sounds as if he is the only person in your immediate family who has behaved well, and if you are lucky he will start to see you again. The first sentence when you described your late husband only visiting his parents to make sure he got the bulk of the inheritance made my blood run cold. What a toxic family, I am not surprised your son is distancing himself.