I show Catherine's father as an Alexander Mc Auselan b. abt. 1617 and her mother as Genet Hall b. abt. 1621. Alexander and Katharine (William's mother)may have been brother and sister? Katharine's parents I show as John Mc Auselan and Nancy Colquhoun. Katharine was Robert's first cousin.That is to say Nancy Colquhoun was Robert's aunt, the sister of his father Adam.Apparently Robert was sent to live with his aunt in Ireland after the death of his parents.He would have been about 12 years old.