William Borthwick, 4th Lord Borthwick Scottish nobleman (1490–1543) Parents William Borthwick, 3rd Lord Borthwick Children Margaret Borthwick Catherine Borthwick Thomas Borthwick, Master of Borthwick Janet Borthwick John Borthwick, 5th Lord Borthwick Siblings Catherine Borthwick Gavin Borthwick of Fenton Partners Margaret Hay