Related Clues:

• Jacob, to Esau, for short
• Paris, to Nicky
• One with all the answers?
• Potential aunt, for short
• Close male friend
• Honest, informally
• Bro's female counterpart
• Gal in the family
• Meg, to Jo
• Sib to Sis
• Informal family member
• Brother is starting to behave badly
• Shortened word for a brother or sister
• Rotation of planetary sphere is relative
• Twin or quadruplet, for short