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She was in town for her brother’s, Brett’s, birthday. or She was in town for her brother, Brett’s, birthday. or She was in town for her brother’s, Brett’s, birthday. or ?

  • "She was in town for her brother Brett’s, birthday." Please see also English Language Learners Good Luck. – Kris Mar 8 '18 at 9:31
  • The possessive apostrophe-s applies to the whole phrase "her brother Brett". HTH. – Kris Mar 8 '18 at 9:32