Jellis' younger brother, Adam, was also a Judge.

(5) Douw Fonda m., 1725, Maritje Vrooman (-1756) d. of (4) Adam; and 2nd, Mrs. Debora Veeders Wemp (1710-70); 4 sons, (6) Maj. Jellis, Adam, Peter, and John, and d. Margaret.

(6) Lt. Col. Adam (1734-08) m. Neeltie Briese (1735-20). He was a county Judge and member of the Legislature; 3 ch.: (7) Maria, Brig. Gen. Henry, and Douw Adam. (8) Dow Henry and Henry Dow (1809) were twins.