Hunter Biden and Donald Trump Jr. are above the maximum enlistment age for every service (though exceptions might be made for direct commission physicians if they happened to be licensed physicians). Barron is still a minor.
I guess that leaves AOC, but it might be worth remembering a fair number of Congressional reps and Senators actually have served or even continue to serve in the Guard and Reserve. A much higher rate than the population at large. It's currently 19% for Congress and 7% for American adults in general.
Hunter Biden already has an Other-than-Honorable Discharge (IIRC) from the US Navy, because of his well-known drug problems. Age can be waiverable but I doubt that drug discharge can.
I guess that leaves AOC, but it might be worth remembering a fair number of Congressional reps and Senators actually have served or even continue to serve in the Guard and Reserve. A much higher rate than the population at large. It's currently 19% for Congress and 7% for American adults in general.