Jannetje PIER (1657) and her husband, Jan Dufour, had a daughter born 1681. Grietje DUFOUR.
Grietje was the grandaughter of Jan Teunis Pier (1631).
Grietje married Teunis Arent Pier (1670). Teunis (1670) was nephew of Jan Teunis (1631).
The grandson of Grietje , Johannes Ostrander, married the grandaughter of Grietje, Maria Westfall .

Pedigree of many Ostranders have multiple paths of ancestry back to Dufour and Pier families of 16th century.