i have very little experience of older teenagers living at home, so i have no real frame of reference as to whether this is typical behaviour or not but i am at boiling point and am very close to exploding. Partners son is between jobs, so living here at the mo. Its my house and partner is also living here temporarily. Stepson is behaving like kevin the teenager. Hes 20 but is sloping round, staying in his room all day, makes a mess and does absolutely nothing in terms of clearing up etc. Hes borderline rude towards me but his father thinks the sun shines ooha so he never pulls him up. Hes sullen, moody and this hulking great presence. He leaves fag ash and cigarette buts on the floor. I've been nothing but welcoming, although I'm pretty much now avoiding him and so we don't really speak. Last night, through the open bedroom window, I heard him taking a pee in the back garden, in the drain right under the kitchen window. It feels like the final straw and a total lack of respect. So aibu or is this pretty standard? His father will side with him if I say anything.