Stop bullying me/us. If you're a bully that comes over in how you interview for jobs, so no one will want you. Be a NICE person, be a TEAM player, then your luck will change.
That (or something like it) is an idea for what you could say.
Your parents could say these are the rules (hand over rules written on a piece of paper), keep them, or get out. Refuse & I'll get the police/social services to throw you out. This is our house, you're an adult now, it's our rules or get your own place.
Any bullying could be reported to social services so they get a record of his behaviour as evidence. If they do need to evict him, evidence of the long term nature of the problem could be useful.
Sorry you're going through this. He's doing it because he can. If no one will stand up to him he thinks he's getting away with it. You & your parents need to show him that he cant, not any more.