DSS is 19, at uni he is disrespectful to DH and treats him like an ATM. DH and DSS’s mum split after a relatively short relationship when he was 1. No marriage, no assets. He met me shortly after, married relatively quickly bought a house and we worked hard to support DSS whilst accumulating wealth for ourselves. DH and I have supported him and his mum, paid for him to be privately educated and he is now at a top tier uni. His mum struggles, can’t seem to keep a steady job and has moved from rental to rental. Now at 19, DSS needs to be on the rental agreement, she has had to move far away from his uni due to costs. DSS works to contribute to his mum. He is SO angry at his dad for leaving his mum, he thinks he should have stayed and given him a stable upbringing rather than him feeling responsible for his mum. I think he IBU?