Margaret had married a Thomas Johnson , but he and his son , John , changed their names to Douglas .
Isabel arranged for the Bonjedward estate to be passed to their half - sister , Margaret , who became 1st Laird of Bonjedward .
Margaret had married a Thomas Johnson , but he and his son , John , changed their names to Douglas .
Isabel arranged for the Bonjedward estate to be passed to their half - sister , Margaret , who became 1st Laird of Bonjedward .