Margaret's father remarried in 1551 placing Margaret's birth prior to that date. She had married John Hamilton who died before 15 Sep 1540 (see research notes in his profile for details) placing her marriage before that date and her birth before 1528.
Sources
↑ 1.01.1Paul, James Balfour. "The Scots Peerage : founded on Wood's ed. of Sir Robert Douglas's Peerage of Scotland; containing an historical and genealogical account of the nobility of that kingdom", Edinburgh: David Douglas,1905, Vol. II, Archive.org,
p. 405
↑ 2.02.1Paul, James Balfour. "The Scots Peerage : founded on Wood's ed. of Sir Robert Douglas's Peerage of Scotland; containing an historical and genealogical account of the nobility of that kingdom", Edinburgh: David Douglas,1905, Vol. II, Archive.org,
p. 38