What's a reasonable way of splitting finances when living together?

This is my living hell right now. I’ve been married 2 years and since my children are with us 50% of the time, my husband felt like he should only have to pay a third of the household expenses, so I agreed thinking he shouldn’t have to support my kids. But it’s the same deal, he has tons of extra money and all he does is nag me if the kids are here a little extra after school, if they eat an extra box of mac & cheese. He thinks I should go ask my ex for more money, like he’s an atm. Then he hits me with, he should really only have to pay 1/4th. So kind of shut him down, I said OK if you want to be that way the next time we file a tax return We’re doing it separately because I own the house and because I get the children’s tax credit because I pay for them you therefore you have no right to be a part of that. In addition, since you’ve only paid a third and only wanna pay a quarter going forward when we sell the house the plan was to just buy a house together but how about we just figure out what equity you put in and how much the house appreciated it and that would be your ownership stake. They don’t think of those sort of things, right? Doesn’t make for a very happy marriage though.

/r/blendedfamilies Thread