But once graduated that car could not be included on the parents' policy unless the adult child lived at home,
rules may vary by state.
and they vary greatly. I had a detailed discussion with our insurance company b/c I couldn't figure out why they insisted our oldest stay on our policy post college graduation esp. since they KNEW via renter's insurance there was another address but they insisted that so long as our address was listed on the driver's license they considered it the driver's 'permanant address'. I then contacted the DOL who explained that their definition (per our state) is a fixed location where you officially reside and which serves as your point of contact for legal, administrative, and personal matters so since my oldest DOES NOT use their residence as their point of contact for legal or administrative purposes (strictly b/c of terrible postal services) our address is considered the default 'permanant address'. in our case it's beneficial b/c lower premium for oldest/multi-car discount for us result in lower premiums for us to pay.
I try to understand/find out answers to questions I may be asked about a situation before I talk to someone about it.