 He was the father of ship-owner Halfdan Wilhelmsen (1864–1923), factory owner Finn Wilhelmsen (1867–1951), ship-owner Wilhelm Wilhelmsen (1872–1955) and businessman Axel Wilhelmsen (1881–1957).Halfdan Wilhelmsen was the father of Mistress of the Robes Else Werring (1905–89), married to ship-owner Niels Roth Heyerdahl Werring (1897–1990).Wilhelm Wilhelmsen (1872) was the father of ship-owner Tom Wilhelmsen (1911–78), who was the father of the owners of the Wilh.