[janet skelton.FTW]
Sir William was the son of Sir Robert. He was the hereditary Sheriff ofRenfrew. He obtained from King James III, a charter confirming him in thebaronies of Elliotown and Castletown (i.e. Castle Semple) on October 4,1474. He married Margaret, daughter of Lord Cathcart. He had 1 child:Thomas. According to the History of the Eglintoun Family: Sir William ofEliotson married Angus Montgomery and had a daughter, Mary, who marriedJohn Brisbrane of Bishopton. John was executor of his brother-in-law,Thomas's estate in 1490.