I posted yesterday about my DSS but i'm looking to see if i'm BU on this. Long story short, DSS is 17 at the end of this month, since DP split with his mum she's been trying to turn him against DP(and me). His mum lied and said I was the reason for the split, when DD(now 6) was born she told him DP didn't love him which made him resent her and used to push her when she'd just started walking and we still have to supervise them now.
DP and DSS don't really have a relationship and he hadn't been here since Christmas until Sunday when DP's ex messaged him and told him to pick him up as she'd caught him having sex. He has been having sex with different girls for around a year, when DP spoke to him when it started he was told it wasn't any of his business.
He came here Sunday and was angry because we swapped the rooms around. I went out with DD and he came back drunk which DP dealt with.
DSS was out last night we didn't know where until DP had a message from his ex telling him that he was at her house saying he wanted to go back there and was swearing at her etc. She said if DP didn't pick him up she'd call the police. DP picked him up and he was still the same here. He was shouting at us and threatened DP, he then started ripping his posters up. This all woke up DD. DP was shouting at DSS which was making things worse. I suspect DSS may have taken something but I obviously don't know.
He was fine with me all day, he was even fine with DD when she finished school. Until DP got home. DP asked if he wanted to go anywhere, DSS said no and that he never wants to go anywhere with DP which led to then arguing as DP calling him disrespectful. I've taken DD to my mums but we can't stay here. DP says DSS was still the same and said we have to stick by him but he's making it clear he hates us/DP especially.
AIBU in not wanting him here?