Will my fiance 's child support become my responsibility when we get married in Florida?

As a general rule, you are now and will remain a ‘legal stranger’ to your fiancé’s child both today and following your marriage unless you chose to adopt the child after your marriage. Otherwise, you have no legal obligation or rights with reference to your fiancé’s child when you marry. A word to the wise: Rarely is adopting your new spouse’s child a good idea. Your spouse’s ex will no longer owe child support to your new spouse and should your marriage fail (as almost half do), YOU may owe child support.