My sons father told me his taxes were intercepted. Could it be because he owes in child support

If there is an arrearage in child support, then the Department of Revenue could have issued notice of an IRS intercept, in which case the IRS would hold the refund and forward it to the State of Florida. It could be several weeks to a month or more before the money will be forwarded to you by the State.

That is the likely reason. There are other reason to intercept a tax refund, but I think that is the most common - certainly if he has an arrearage.