Privately, he was highly eccentric with his preference for communing with spirits, including those of Leonardo da Vinci, Sir Wilfrid Laurier, his dead mother, and several of his Irish Terrier dogs, all named Pat. He also claimed to commune with the spirit of Franklin Delano Roosevelt, American president and close friend. He sought personal reassurance from the spirit world, rather than seeking political advice. Indeed, after his death, one of his mediums said that she had not realized that he was a politician. King asked whether his party would win the 1935 election, one of the few times politics came up during his seances. His occult interests were not widely known during his years in office, and only became publicized later, and have seen in his occult activities a penchant for forging unities from antitheses, thus having latent political import. In 1953 Time Magazine stated that he owned – and used – both a Ouija board and a crystal ball. In the 1970s biographers used the extensive diaries he kept during most of his life to delve deeper into his occult activities. One person he held seances with was Canadian Artist Homer Watson.
King never married, but had several close female friends, including Joan Patteson, a married woman with whom he spent some of his leisure time.
Some historians have interpreted passages in his diaries as suggesting that King regularly had sexual relations with prostitutes. Others, also basing their claims on passages of his diaries, have suggested that King was in love with Lord Tweedsmuir, whom he had chosen for appointment as Governor General in 1935
