Sharing Expenses After Marriage?

I have lived with my boyfriend and his two children ages 7 and 12 in his house, that is paid off, for several years. We divide the expenses and he pays for the kids' expenses, electric, and some bills and I pay the groceries, cable, and landline phone. He pays for the taxes.

Keep in mind I have my own house that's paid for that I rent out, a job where I make double his income, and I pay the taxes there. My name only is on my house. I cook and maintain his house for all to live in, transport kids sometimes here and there, pick them up from school sometimes as he makes sure dinner is on table and clothes washed.

So, my question is once we get married, he wants to split his household and kids' expenses and then half of the house renovations (update furniture, countertops, etc. and repairs when they come up) and taxes and put this in a joint account. The house is in his name only and possibly his children.

I assume if something were to happen to him, they would get the house. Is this reasonable to pay for a home I don't own although we are living there as man and wife and pay half the taxes. We live in Florida so I believe there a equity law.

By Maria