Utah gives allows in-state tuition for community college after 6 months’ residency (established by ID, register to vote, work, address) and after 12 months, for 4 yr college. But the cost of living in Salt Lake City has gotten very high, plus it’s quite isolated from the rest of the country.
Can you be more specific about where your relatives live? If it’s in New York State, you’re golden. Huge SUNY system, and cheap for in-state. If it’s in MA, also not bad. UMass Amherst is an excellent school.
I really like the idea of your coming back to the US for the rest of high school, so that you can apply in-state from an in-state high school.