I was living on my own too and moved back in with my mother last year.

It'll take some getting used to, believe me. They'll probably try and impose some rules and such, but at the same time they'll remember that you have been on your own, so you yourself know what's best for you. My situation's somewhat different because I don't have to pay rent, but I do pay a 1/3 of utilities just so I can remember that I do have responsibilities and it's not necessarily a free ride.

On the other hand, it's awesome not having to pay hundreds of dollars in rent like I used to, and I realized the importance of having a nice home cooked meal!!