The 1st son was usually named after the father's father

  The 2nd son was usually named after the mother's father

   The 3rd son was usually named after the father

    The 4th son was usually named after the father's eldest brother

     The 5th son was usually named after the mother's eldest brother

 The 1st daughter was usually named after the mother's mother

  The 2nd daughter was usually named after the father's mother

   The 3rd daughter was usually named after the mother

    The 4th daughter was usually named after the mother's eldest sister 

     The 5th daughter  was usually named after the father's eldest sister