Isaacs has been in a deeply loving relationship with his partner, Emma Hewitt, since the late 1980s, but the story of how they finally solidified their union is hilariously unromantic. After decades of living together happily without a legal marriage certificate, Isaacs was offered a major acting job in the United States. Upon looking into the astronomical costs of the American medical system, the couple realized that securing a comprehensive, stable Hollywood health insurance plan required being legally wed. Isaacs openly brags that they didn't get married out of traditional societal pressure or sudden bursts of romance, but strictly so his family could get affordable dental and medical coverage while living across the Atlantic.