To qualify for resident status the questions are: Where do they vote? Where do they live? Where do they have a drivers license?

If they vote in CT, have a CT drivers license and go home every day to a house/apartment/condo/trailer in CT, then they are residents.

If they own property in CT but vote in Florida (or fill in your state of choice), have a Florida drivers license and live in Florida for most of the year they are non-residents.

For example, I own a house in Maine, but I have to purchase a non-resident license as I do not vote in Maine, have a Maine drivers license or live in Maine for the majority of the year.