This branch of the Slingerland family descend from Tuenise Corneliese Slingerland, born 1617, who emigrated from Amsterdam, Holland, in 1650, settling in Beverwyck. He purchased from the Indians a tract of ten thousand acres lying in what is now the towns of Bethlehem and New Scotland, Albany county, New York. The chiefs who conveyed the land, Wolf, Bear and Turtle, represented three tribes who were original owners of the land. Much of this land yet remains in the Slingerland name. He married (first) Engletje Albertise Bradt; (second) April 9, 1684, Geertie Fonda, widow of Jan Bikker. Of his children those who reached maturity and left families are: Arent, Albert, Cornelis, Elizabeth, who married Thomas Eackars, of New York City. Albert is the ancestor of the family in Slingerlands, Bethlehem town, whose leading representative, William Harris Slingerland, died at an advanced age, ninety-two years, in 1910.
(II) Arent, son of the "emigrant and founder," Tuenise Cornelise Slingerland, inherited lands from his father to which he added. He was twice married, his second wife being Gertrude Van Voorst, whom he married October, 1688. In his will, made January 28, 1712-13, he mentions children:
- Johannes, born May 10, 1685;
- Engeltje, November 10, 1689;
- Tuenise, of further mention;
- Gerrit, May 2, 1697;
- Sara, July 21, 1700;
- Alberties, January 2, 1704.
(III) Tuenise, son of Arent and Gertrude (Van Voorst) Slingerland, was baptized March 18, 1694. He married (first) Elizabeth Van Der Zee, October 4, 1719; (second) Cornelia Kipp, July 5, 1724. He was buried June 29, 1746, his wife, March 16, 1745. Children baptized:
- Arent, April 24, 1720;
- Wouter, November 4, 1722;
- Hester, January 19, 1729;
- Albert, November 27, 1732;
- Isaac, August 13, 1734;
- Geesie, September 12, 1736;
- Engeltje, December 25, 1738;
- Abram, of further mention;
- Anna, February 22, 1741;
- Geertruy, September 25, 1743.
(IV) Abram, son of Tuenise and Elizabeth (Van Der Zee) Slingerland, was baptized November 29, 1739. He married, December 4, 1756, Rebecca Viele. Children:
- Tuenis, baptized October 2, 1757;
- Petrus, of further mention;
- Abraham, born December 13, 1762;
- Catherine, May 10, 1765;
- Cornelis, August 28, 1767;
- Maria, December 15, 1769;
- Albert, December 24, 1773;
- Stephanes, October 23, 1775.
(V) Petrus, son of Abram and Rebecca (Viele) Slingerland, was born March 4, 1760. He married, January 2, 1785, Maritie Van der Werker. Child, Abraham.
(VI) Abraham, son of Petrus and Maritie (Van der Werker) Slingerland, was born May 20, 1793. He married Lydia Van Pelt. Children: Christopher D.: Charles B., of further mention; Louisa Malvina; Hiram; Julia; George Oscar. All deceased except George Oscar, now living in St. Louis, Missouri, who was a private in a regiment in New York. Abraham was a soldier in the war of 1812.
(VII) Charles B., son of Abraham and Lydia (Van Pelt) Slingerland, was born at Detroit, Michigan, September 5, 1829, died at Round Lake, Saratoga county, New York, in 1897. In 1841 he settled in Troy, where he was educated and passed his business life. He was a successful business man, engaged principally in manufacturing lumber and in real estate. In 1880 he retired from active life. He married Delia Ann Slingerland, of Yates county, New York, who bore him seven children, now (1910) all deceased except George O., and Augusta Thankful, who married H. L. Kemp, of Cohoes, New York.
(VIII) George Oscar, son of Charles B. and Delia Ann (Slingerland) Slingerland, was born in Green Island, Albany county, New York, August 12, 1872. He was educated in the public schools of Green Island and Troy. He began his business life in a paper box factory and later became a manufacturer, a business he is yet engaged in, in a factory and office at Mechanicville, New York. He is a prosperous and efficient man of affairs and prominent in public life. He is now serving a third term as trustee of the village corporation and president of the Mechanicville chamber of commerce. He is affiliated with Montgomery Lodge, Free and Accepted Masons, of Stillwater, Ondawa Chapter, Royal Arch Masons, Mechanicville, and the Knights of Pythias of Cohoes. He is a Republican in politics, and a member of St. Luke's Episcopal Church. He belongs to the Holland Society of New York by virtue of his Dutch ancestor, Tuenise Cornelise Slingerland. He married, December 24, 1895, Isabelle Agnes, daughter of David and Mary (Robbins) Robertson, of Pittsfield, Massachusetts.