He was married in 1827 to Jane Walter Sibley, of
Sutton, Massachusetts, a relative of Judge
Solomon Sibley and a distant relation of the Confederate general
Henry Hopkins Sibley. He was succeeded in the baronetcy by his eldest son George. His second son Henry pre-deceased him. His youngest son Norman George was the father of the prominent diplomat
Miles Wedderburn Lampson, who was elevated to the peerage as
Baron Killearn in 1943. His only daughter, Hannah Jane, was married to the poet
Frederick Locker. Their children included the British Conservative MPs,
Godfrey Locker-Lampson and
Oliver Locker-Lampson. His son-in-law Frederick Locker-Lampson included this pen portrait of Sir Curtis in his posthumously published memoirs,
My Confidences (1896): "I am told that as a youth he was wise beyond his years and intelligent in advance of his experience ... He has foresight, judgment, a clear apprehension of men and affairs, a strong will and a sweet temper, and his success in life may be attributed to his own and sole exertions -
Sapientia duce, fortuna permittente." His grandson, Godfrey Locker-Lampson, wrote of him: ==Notes==