Related Clues:

• Alex Dunphy, to Luke, on "Modern Family"
• Cain, to Abel, informally
• Member of a fam
• She's part of the fam
• Sibling's address
• Sib, sometimes
• Relative term?
• Sis
• Venus to Serena, e.g
• Dad's daughter
• Sibling's nickname
• Kim, to Khloé Kardashian
• Bro, to a sis
• Pippa, to Kate
• In-law's wife, possibly