Margaret was the daughter of John Patterson and Agnes Moffett. The date and place of her birth have not been found.
She has died but the date and place are unknown.
Her husband was Francis McCown, who she married in ABT 1710 in Ireland. Their eight known children were Isabella (c1732-?), Markham (c1734-?), George (c1740-?), Margaret Ann (c1742-?), James (c1744-?), Malcolm (c1745-?), Francis Jr (?-?) and Katrine (?-?).