Pedigree on Jamie Allen's Family Tree & Ancient Genealogical Allegations - dates look doubtful
Sources and notes
Burke's Commoners, vol I, p 455: [William] "m. Elizabeth, daughter of Hamilton, of Raploch, aunt to Gavin Hamilton, commendator of Kilwinning, and confidential minister of Mary Guise, Queen Regent of Scotland ..."
On GenCircles, charrowden/1/37487 says Janet was 1524-1576.
Jamie Allen's Family Tree & Ancient Genealogical Allegations has her born about 1535.