He married his first cousin, Catharine Bruyn, January 5, 1788-89. She was born June 24, 1720, and died August 10, 1793. She was a daughter of Jacobus Bruyn, and his wife, Tryntie, who was a daughter of Captain Joakim Schoonmaker, and died August 27, 1763, aged seventyeight. The father of Jacobus Bruyn " was a native of Norway, and came here in the Dutch time, and married Gertruy Esselstein." Jacobus Bruyn lived at Bruynswyck, in Ulster County, and died November 21, 1744, aged sixty-four. He had a sister E-sther, who married Zachariah Hoffma'n. Abraham Hasbrouck was one of the most prominent men of Ulster County, and was for thirty years a member of the Legislature. He settled in Kingston in 1735, and died there November 10, 1791, and "was buried the next day with the honors of war." He left eight children, -- Elsie, wife of Abraham Salisbury; Catharine, wife of Abram Houghtaling ; Mary, wife of David Bevier ; Jonathan, who married Catharine, daughter of Cornelius and Catharine Wynkoop ; Joseph, who married Elizabeth Bevier; Jacobus, who married Maria, daughter of Charles De Witt ; and Daniel, who married Rachel, daughter of Colonel Jonathan Hasbrouck (his uncle), of Newburgh.

Isaac Hasbrouck, the second son of Josejjh, was born March 12, 1712 (O.S.). In 1766 he married Antie Low, widow of John Van Gaasbeck. They had three children -- Joseph, Elsie and Jane, wife of John Crispell. Isaac died April 6, 1778, "and was buried at the Shawangunk church-yard, near the buryingplace of Jacobus Bruyn's family." His widow, Antie, died October 2, 1784.