Authoritative friends, but friends nonetheless. This is a strange transition. And so you do. That's what friends are for. Friends gather together at the holidays and birthdays and funerals.
Friends buy each other wonderful gifts.
But the best friends in the world seldom live together. It's just too damn hard to be someone's friend all the time. Living with your best friends would be like having lobster for dinner every night. You would get sick of life's rarest treasure. After a certain point, you need to have your own place.