Me and my partner live together with my dd who's 4, and our ds 4months. My partners dss who's 6, comes to stay every weekend friday to sunday. I have started to dread weekends as dss has become very difficult to be around. He has started to swear and throw massive tantrums when he doesn't get his own way or if he's told off. He has now become aggressive trying to hit me. He reacts like this to everyone, his mother tell's dp that she is having these problems with him during the week as well, he bit his nan last week. My dd is now copying his behaviour and me and my partner are arguing over it. I feel like i don't think i can cope with it anymore, too upsetting and stressful. Have asked dp to try and discuss it more with ex'p but hasn't got round to it. Anyway, my partner has gone to stay at his sisters for a few days to give us both time to think if we can continue the relationship. Don't know what to do for best, i'm happy all week, and then weekends are a war zone. Any advice?