Son Jan Teunis Pier born 1631. Jan married M. Jans. They had a daughter, Jannetje Pier, born 1657. Jannetje married Jan Dufour. They had a daughter, Grietje Dufour born 1681.
Grietje Dufour married Teunis Arent Pier (1670). He was son of Arent Teunis Pier (1637).
Grietje Dufour Pier had two daughters, Maria Pier(1711) and Jannetje Pier (1706).
These Pier sisters became the grandmothers of Alexander Ostrander (1783).
What info do you have?