The line of descent of this branch of the Slingerland family is as follows: (I) Teunis (Tuenise) C. Slingerland, born 1617. (II) Albert, born 1666. (III) Johannes, baptized 1696. (IV) Albert, born 1733.
(V) Henry, son of Albert and Elizabeth (Moak) Slingerland, was a farmer of the town of New Scotland, Albany county, New York. He married a kinswoman, Jemima Slingerland, and had children, among whom was Henry H.
(VI) Henry H., son of Henry and Jemima (Slingerland) Slingerland, was born in the town of New Scotland, Albany county, New York, 1808. He established in Albany the wholesale house of H. H. Slingerland & Son, which he operated successfully until 1889, when he sold out the business to his sons, John B. and De Witt C. He married Hannah Winne.
(VII) De Witt C., son of Henry H. and Hannah (Winne) Slingerland, was born in the town of Bethlehem, Albany county, New York, 1850. He was educated in the public schools, and began his long and active business life in Albany as a clerk and bookkeeper for the firm of H. H. Slingerland & Son. In 1889, in association with his brother, John C. Slingerland, they purchased the business and together continued a wholesale and retail grocery business. Mr. Slingerland is a successful business man, and has reached a position of honor and influence in the city of Albany. He is a member of the Masonic order, belonging to Ancient City Lodge, No. 452, Free and Accepted Masons. He is a Republican in politics, and a member of the Unconditional Club. He married, March, 1875, Alice Cuyler, daughter of George Nelson and Eliza Ryckman (Martin) Geary, and granddaughter of George Geary, born in Newfoundland in 1799. He was a merchant tailor. George Nelson Geary, son of George Geary, was born in Albany, New York, in 1824. He married, in Albany, in 1849, Eliza Ryckman Martin, born in Rochester, New York, in 1827. They had nine children, four of whom survived childhood. Children:
- Alice Cuyler, married De Witt C. Slingerland.
- George Nelson.
- Abraham Lincoln.
- Grace May, married William H. Chamberlain, of Albany, and has a son, Harry L. Chamberlain.
Children of De Witt C. and Alice Cuyler (Geary) Slingerland:
- Henry Cuyler, educated in the public schools of Albany; a graduate of Albany high school, and for two years attended Williams College. He is associated with his father in business. He is a member of the University Club, and is sergeant of Troop B., New York National Guard.
- Frank Nelson, educated in the public schools; graduate of Albany high school and Albany Business College. He is engaged in the automobile business in Albany. He married Anna MacDonald, and has a son Donald MacDonald Slingerland.