I never really thought about it until just a few years ago, when Kate and I were speculating who "Uncle Ian," mentioned in a TNAOS episode, might be. Either Jonathan's or Martha's brother. We decided there had to be a sizable group who knew about the baby 'Russian experiment' that the Kents found.
Their lawyer, a judge, a doctor, a nurse, a child services worker, a police officer/sheriff- just for starters. I'm a teacher and a mom, so I know the documentation and health records that are necessary for a child to attend a public school. In all, I think, incarnations of Superman he attended public schools and went to college. He needed proper documentation, not forgeries, to do it.
Still..........of all people to agree with us, huh, Kate? Max Landis?!