Not sure about living with relatives as much as using the address or any address that works. Awhile back, there was some commotion about that topic in the Charles County schools, seems to have died out rather quickly though. Same, same when the fed found out many of their higher paid employees had bogus degrees. When they correlated skin color to probable outcome.....
Oh I'm sure some are giving fraudulent addresses but from what I have heard (sources) they stay with family (extended).
The thought being, they are getting the kid out of a bad situation. Problem is, as we have seen in several incidents at GHS, the bad situation finds out where they are and comes a calling.
Most likely they find out where they are via stupid use of social media.
Nobody is going to complain because the number counters in Baltimore (Board of Ed) have them by the purse strings.