Related Clues:

• Jem, to Scout Finch
• Little sis, for example
• Your bro, for one
• 12- or 62-Down
• Roommate, often
• Big sis, for example
• Li'l sis, for example
• Neighbor on a family tree, informally
• Bro or little sis, to you
• Bunk bed sharer, often
• Little sister or brother?
• First roomie, for some