Your bank is on notice that the son has received monies from the state to which he is not entitled and the state has demanded their return.
If you think there is a colorable reason why you should not satisfy that demand, you need to run it past your bank's legal counsel. As far as providing the son's contact information, that's not really your right unless they can point you to a Florida law or regulation that says it is.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.