Sorry, but he sees you as a meal ticket. I bet you’d find that if the house was his, miraculously he would be screaming at his kids to tidy up.
you don’t like the unhealthy competition between his kids and your child? It’s more than that though isn’t it? - his kids are a bad influence on your child and you know it.
don’t expect to get a straight answer from your kid either - they probably feel bad and pressurised and scared to tell you they are not happy with these bullying step-siblings who steal all their toys, make them feel bad, and hog all their mum’s time.
the situation will get much much worse and draining as your partner’s brats get to teenagers and essentially you are getting untold stress and resentment for nothing.
you need to formulate an exit plan as your partner is actually taking you for a ride, but you just can’t see it.
what you want, counts for nothing to him and you’re actually just a meal ticket to him.
to say you’re getting a raw deal is understatement of the century.
sounds like he’s getting free rent, a housekeeper, cook, childminder, free money, a roof over his head, cleaner, general dogsbody, etc. No wonder he’s got a smile on his face and is cracking jokes.
Dont even kid yourself that your kid is happy with this situation. If his bratty kids didn’t dominate the house so much, that would free up time and space for your kid to pick his/her own friends from school to have sleepovers and hang out.