I am not related to these people, but I have a book with a little information on them:
"Jan Barentsen Kunst was the first immigrant of this family in America.He sailed on the ship 'Giled Beaver' in May 1658 from Alkmaer, Holland, The Netherlands, twenty miles from Amsterdam.He located in Beverwyck, Albany County, NY."
"Jan Barentsen Kunst was the son of Barent Kunst of The Netherlands.He was born in Alkmaar, Holland, The Netherlands.He married (1) Jennette Ariens.They had one child, a daughter Hillitje Jane who married Nicholas Roosevelt.They are the progenitors of Theodore Roosevelt and Franklin Delano Roosevelt.He married (2) 29 April 1663 Jacomyntje Cornelis Slecht, daughter of Cornelia Barentsen Slecht (Sleght) who was born in Woerden, South Holland, and died 1671 at Wiltwyck, NY.Jacomyntje was baptized 25 July 1645 at Woerdon."
"Jan Barentsen Kunst was active in the church of Wiltwyck.The records of Rev. Hermanus Blom in his 1663-1666 Account Book of Parishioners lists Jan Barentsen Kunst ten times during that period.Jan died before 27 October 1668.His widow remarried."