I HAVE to fight DD on the chores thing - if she isn't made to do her chores, then DS1 and DS2 refuse too on the basis that it's 'not fair'. Then none of them do any chores, and I can't always PHYSICALLY do them myself due to my disabilities. I actually had yo send DD to her Dad's for the Christnas holidays, 600 miles away in the top end of Scotland, because I needed the break. I've been so close to calling SS & throwing in the towel too lately, and DD isn't even 16 yet.
We have the added layers of DD's SN's, though. She unequivocally could NOT cope away from home without Carers. Which I don't get. But her meltdowns make my 10yo and 2yo cry and shake, and hide under their beds because they are scared, as she breaks things around the house.
Most of it is over : the fact that I can't afford to buy her separate dinners, and have time to cook them when SHE wants to eat, thus meaning she has to eat a cheaper, home cooked meal with all of us, at a set time if that dinner can't be reheated (like risotto etc.). That she can't have £15 a week pocket money like her friends do - because I would also have to give DS1 and DS2 £15 a week each. That's £45, out of £71 income support...
And last but not least, actually imposing times that she must be in by. Because she is still at school. And I want her in by 8.30 pm on a school night, 9-9.30pm at the weekend. That's always been non-negotiable until the end of Y11. All my DC's know that.