Leeuwenhoek's family members in 1673

October 24, 1673

To celebrate Leeuwenhoek's 41st birthday, October 24, 1673, if only his close family and their spouses and children had come to the party, these three dozen people would have been there.

His parents and grandparents were dead, as was one brother, three sisters, his uncle Hugo (and his wife), his first wife Barbara, and four of their children. That left thirty-two close relatives:

Cousins, children of Uncle Hugo and Aunt Magdaleentgen:
Some of the siblings' children and cousins' children had spouses and children of their own. None of them would have had far to travel. Sister Catarina and her family lived in Rotterdam. The rest lived in Delft.

Delft DTB records