 John's first marriage was to Amie mac Ruari, heiress of Clann Ruaidhrí (which was founded by Ruaidhrí, elder brother to Donald, founder of Clan Donald).John later divorced Amie and married Margaret, daughter of Robert II.The children from John's first marriage were passed over in the main succession and the chiefship of Clan Donald and the later Macdonald Lords of the Isles would go on to descend from John's second marriage.