Is it legal in Florida to repay a personal loan to the lender's spouse?

    If you are still legally married, then the money owed from your sister and her husband is a marital asset.  You don't indicate if there is a promissory note or some other written agreement evidencing the debt or if it is just a verbal promise.  Nonetheless, unless there is a written agreement that the money is to be paid to your husband alone, then your sister can make the payments to you.  If you need the funds to provide for yourself and your daughter it is unlikely that a court would determine that you are wasting marital assets.  I would, however, keep track of the payments and how you are using the money in case your husband ever raises this issue in a future divorce.    In the mean time, contact the agency that handles child support in your county and see if you can file an action to get your husband to pay you child support.  It is not necessary that either party file a divorce for you to seek monies to help support your daughter.  Raising a child is an expensive venture.  He has an obligation to your daughter whether he likes it or not.  It seems like you are already shouldering the yeoman's share of the responsibility.  He needs to contribute too.