In the former - if your parents still live in your childhood home - you likely still have a room there. It may even be preserved, reflecting the style of your seventeen-year-old self. You might also have a lot of things in storage there: toys, clothing, yearbooks and other memorabilia.
On the other hand, your parents may have moved since you moved out. Moving their household may have meant giving you all of your possessions to keep at your own place (or getting rid of many of them). When you visit their home, it likely doesn't feel like your home since you never lived there.
Which do you fall into? Do you still go back to the "family home", or do you visit your parents in a new place? What important differences do you see between the two experiences?