Is there a family tree?
No. There is no tree showing all family connections, but you will have a family list with all family members and relationships specified.
If you are interested in your family history and would like to preserve stories about your ancestors, you can create profiles for an unlimited number of them and add stories about them to their profiles. Your family will see a list of all their family members, from which they can easily access all their stories, but there is no family tree indicating relationships.