 By 1234, Isabella had inherited the Mormaerdom of Menteith, and so Walter became Mormaer or Earl of Menteith by right of his wife ("jure uxoris").Walter appears to have had a son named Henry who witnessed a charter, dated to 1250, of Maol Domhnaich, Mormaer of Lennox.His daughter Isabel was given in marriage to Gilchrist Mure.