I've been with my partner for 5 years and he moved in with us almost 4 years ago (which was unplanned) after my teen DS passed away from suicide.
I've got 3 DC’s but only DS(15 this week) is living with me, my elder 2 are fine with partner and get on well with him.
DS however doesn't, they got on when partner first moved in and would go on walks, play video games, talk about films etc. Partner really got DS to come out of his shell again as he wasn't really speaking when DS passed away as they were close. He had a lot of anger and he had counselling via zoom which he started refusing to engage with.
He seems to be coping fine generally but Thursday was the anniversary of my sons death so I told partner to cut him a little slack if he gives us attitude and with chores etc. Yesterday partner had his children over and they were playing football in the garden, DS gets involved and purposely kicks the ball over the back fence which results them not being able to get my back (it's unaccessible due to it being unsafe). The children are upset as its a special limited edition ball and DS laughs. Partner was furious and took DS’ skateboard as punishment and locked it in his car. DS comes to me to complain and to try to persuade me to let him have it back, I refused but he then told me he wants to die. Partner thinks this is a way to manipulate me as he only says it when he's in trouble
Other times when we speak to him he says he doesn't but it does make me worry.
Today, DS grabbed partners 12yo child's wrist during an argument about a video game, DS says partners child hit him but we aren't 100% on that but DS left a red mark on the child. Partner was furious. DS was smirking the whole time of myself and partner telling him off. Partner then started shouting at him that he's spoilt and needs to stop acting so childish. Partner grabbed DS by the wrist and told him he won't be getting his birthday presents and his friends won't be coming over next weekend. DS was crying and I'm thinking he may have went to far.
AIBU? I do admit I am a little soft on him especially after losing my elder son. I need some opinions and advice from another point of view.