ISAAC CASPERSE HALENBECK, the third son of Casper Jacobse, married about 1683 Dorothy Bosch, daughter of Hendrick Bosch of New York and his second wife Maria Eshuysen. Henry bequeathed one shilling to his daughter Dorothy. She was buried in the Albany Lutheran graveyard 7 February 1744; Isaac died in January 1709.
Isaac was administrator of the estate of his brother-in-law Hendrick Ver Wie 17 November 1684.7 Two years earlier he was alleged to have threatened Anthony Lespinard with a knife, the act of a hot-headed youth. He was nicknamed "Hop horse." He continued the accumulation of Albany property begun by his father, buying in 1695 from Hendrick Van Rensselaer about 24 acres of flood land bordered south by the Beverkill, west by the woods, north by the hills, and east by the swamp. His will also mentions an island in the river above Albany. He may have been the Isaac Holsembeeck, laborer, admitted 17 October 1696 freeman of New York City. He was probably the Isaacq Curpensen who signed petition 30 December 1701 pledging loyalty to King William. He served as a deacon of the Albany Lutheran Church; The 1697 census lists him with four children. His will was made 17 November 1708 and probated 28 March 1728.
HALENBECK FAMILY OF NEW YORK by Robert Vincent Anderson - National Genealogical Society Quarterly - v.65; no.2; page 103-104