You can interpret this in many ways from taking pictures of family members, ancestors (using photo albums) to friends who make up your "chosen" family, or even the "Family of Man". What I want you to take are thought out, unposed ,NEW pictures ,not studio shots OF each MEMBER. ( I'll give you ONE GROUP SHOT, OK?
Explain below them who they are and how they make your family. Think like an Artist. Size- View- Placement - and most importantly -LIGHTING.