Jacob Klasen Glas, born in Uithuizermeeden circa 1821, son of Klaas Jakobs Glas and Geertje Sibelts.

He was married in Usquert on October 19, 1843 (1) to
Eike Jans Wieringa, born in Usquert circa 1823, died before 1874, daughter of Jan Gerrits Wieringa and Stijntje Jans Homan.

He was married in Uithuizen on December 12, 1874 (2) to
Geesje Grutter, born in Norg circa 1832, daughter of Roelf Grutter and Aaltje Egberts.
(She was widow of Harm van der Molen, died before 1874.)