Uiltje Johannes van der Schaaf, born in Grouw on April 18, 1822, son of Johannes Haytes van der Schaaf (shipwright's man and shipwright's man) and Wypkjen Uiltjes Veenema.

Uiltje was married to
Minke Pieters Boonstra, born in Grouw circa 1825, daughter of Pieter Johannes Boonstra and Trijntje Jelles Kleefstra.