.
Yes. They know it's bad form for a candidate's family to take away the limelight (or what is called 'oxygen' these days) from his or her campaign. Billy Carter, for example, was oblivious to this protocol, and it almost cost Jimmy his first election. (Bill Clinton is almost as clueless with respect to Hillary's campaign...or so it would seem.)
I've been thinking he fired them ..
You can't fire blood. I know. My fam has tried to fire me on numerous occasions. :-D
Wishful thinking on the Left's part. I've seen both of the sons on TV recently. Let's not forget they have full time jobs they must also attend to.