Gerritje Coster was born during the 1660s. She was the daughter of New Netherland pioneers Hendrick and Geertje Goosens Van Schaick Coster. Her father died during Gerritje's adolescence and her mother re-married.

In November 1688, she married a somewhat older Johannes Roseboom at the Albany Dutch church. By 1706, nine children had been christened in Albany where both parents were members. Six of them were still living in November 1737.

After some time as a wide-ranging fur trader, Johannes Roseboom settled his family near their kin in the second ward where they became Albany mainstays.

In November 1737, she was named along with six children as heirs in the will filed by her husband.

Otherwise, the name of Gerritje Coster Roseboom seems to have dropped from Albany rolls following the baptism of her twins in 1706. Her husband lived at least until 1745.

Sources: The life of Gerritje Coster Roseboom is CAP biography number 5973. This sketch is derived chiefly from family and community-based resources.