..........................................Jan Pier born abt 1557 ....................................................................
Sons Arent Teunis Pier 1637 .......................................................... Jan Teunis Pier 1631
Teunis Arent Pier 1670 .............................................Jannetje PIER 1657 m Jan Dufour........
.......................................................................................daughter Grietje Dufour 1681 ..............

Teunis 1670 married Grietje 1681
two daughters, Maria Pier 1711 and Jannetje Pier 1706 .............................................
Son of Maria married daughter of Jannetje...................................................................................
They had a son, Alexander born 1783---Alexander Ostrander.
I found some of this on ancestry.com