According to Philip José Farmer in Tarzan Alive and Doc Savage: His Apocalyptic Life, Ned married Marie Chauvelin and named their youngest daughter Arronaxe for the Professor. Farmer also notes the name of the eldest Land daughter, Edwina. Arronaxe was the grandmother of Doc Savage, and Edwina the mother of Sam Spade.
In his article The Land Family, Wold Newton researcher Brad Mengel states that Edwina was actually the second daughter, and that she had an elder sister, Michelle, and brother, Jacques. Youngest of all were two brothers, Peter and Edward.