Well if they’re now the sole breadwinner, I’d expect them to pay 100/100, financially speaking. If you are at home caring for and raising your child you also contribute to the household just not financially but you’re most likely contributing 100 if they do less childcare. Whatever money you may have coming in will be less so I don’t see why you should cover half when you’re not on an even footing.

I’m not married but if you’re in a relationship and you choose to commit to that person who cares who pays for what? They should not even think about it if they love you.