Job pays well but I hate it, I feel trapped

I hate the way my NF does things, I’m not going to go crazy into it but I have a laundry list of issues that could easily be resolved by the parents but they don’t care. The kids have no consistent schedule, 2.5 year old and 1.5 year old basically don’t nap, they sleep until 8:30-9 am, they’re miserable all day. I’ve suggested they are maybe sleeping in too late for them to have a proper nap, they won’t listen to me. It’s benefiting nobody but the parents that like the sleep in. There’s a lot of other issues, like their untrained dog, leaving me with no car but have no real playroom for the kids and no toys in the backyard. I really want to quit, I love the kids, I’ve been with them two years but I can’t handle that they won’t find a solution to any of the issues I have. I can’t go all day without a break with kids this young. I can’t afford to quit and I’m so unhappy. My mental health is in the toilet but I need to pay my bills. It’s so depressing.