Related Clues:

• Shoe stiffener
• They're for the birds
• Squirrel's home
• Elder or alder
• Chart with many lines
• Hammock's attachment
• Ring bearer
• Beech or birch
• One may undergo surgery
• Sloth's hangout
• Theme of the puzzle
• Genealogy chart
• Orchard unit
• Family portrait, of sorts
• Forest denizens