This is from kindergarten cop and the best way I have found to assess class background. Plenty of class traitors have contributed to the great idea, so please don't be defensive. Full disclosure my dad was a janitor who previously was in the army (deceased early 2000-ish) and my mom (divorced) was on disability and incarcerated for most of my life.
Don't let him to close to the house cleaner and your sibling, erhemm! I mean her chid.