When does my son need to start paying child suppport. His wife left him 3 weeks ago but they are still married. They have 2 kids. Lives in florida

He should still be supporting his children - however, he also needs to keep a close accounting and proof of any child support he provides by getting signed receipts with the date and amount and make sure it says "child support' on it and that his wife signs and dates the receipt.   I would suggest he not give her cash, but give her checks or money orders. If he provdes groceries or diapers or school supplies, he also needs to get the wife to sign the receipt and date it.