Even then, if it’s in his Florida home, Melania or his son can own it. It’s no longer his.
There is zero federal requirement that nobody else in the family can own a gun, even the same one owned by the “felon”.
And in Florida, the transfer process is “here, it’s yours”.
If he goes to the range shooting it, then maybe. But this is going nowhere.
You are correct on all three points, however that doesn’t preclude a “mistaken” 3:00AM unannounced FBI Swat Team entry at that Florida home and an Agent being “in fear of his life” when he sees a shadow in a doorway.