The marriage contained "incompatible personalities", though it lasted right to the end of their lives and gave joy to both at times. Hart did joke with his daughter at one point, however, that "trouble with this marriage is that one of us doesn't like sex and the other doesn't like food", and according to LSE law professor Nicola Lacey, Hart was, by his own account, a 'suppressed homosexual'. Jenifer Hart was believed by her contemporaries to have had an affair of long duration with Isaiah Berlin, a close friend of Hart's. Jenifer published her memoirs under the title "Ask Me No More" in 1998. The Harts had four children, including, late in life, a son who was disabled, the umbilical cord wrapped around his neck having deprived his brain of oxygen. The boy was, despite his handicap, capable of remarkable observations on occasion. As a philosopher, Hart had long been interested in the mind-body problem, and he was thus in some sense professionally interested in his son, as well as emotionally invested, if only because his child was first-hand proof of the complex and unpredictable nature of the relationship between mind and body.