He brought a gift from Charles I to Lady Yester as a wedding gift, a jewelled hair-dressing described as a "head busk", a band of small diamonds set in fleur-de-lis to wear at the forehead from ear to ear.
He mentioned Charles' gratitude to her mother Lady Seton for looking after him as a child at Dunfermline Palace.
[2] They had a son, John Hay, 1st Marquess of Tweeddale, who married Jean Scott.
[3] Lord Yester opposed the Act anent Apparel in 1633 and in 1639 was supporter of the National Covenant and had a regiment at Duns Law.
After his death in 1653, his widow Margaret Montgomerie married William Cunningham, 9th Earl of Glencairn.