Related Clues:

• Spouse's sister, for one
• Spouse's dad, e.g.
• Family identifier
• Kin after a hitching
• Your spouse's brother, e.g.
• Father of the bride, say
• One crying uncle?
• It's first on forms
• You might get one at City Hall
• One connected by blood or marriage
• Adam was our first one
• Blood connection is not absolute
• Last appellation
• Considered in proportion to something else
• Adam was our first