Possible Clues:

• Upset writer cut sibling’s son
• Relative newcomer's first record cut
• Younger relative cut by retired writer
• Relative cut applied to rejected writer
• Swan around with man and wife's kinsman
• Relative's gone, lacking oomph -- that's a relief!
• Your brother's boy
• One saying uncle?
• Sibling's boy's relationship
• Certain male relative