On 19 May 1748 Claas Roelfs married
Trijntje Jans, daughter of
Jan Jans Timmerman (ca 1689-) &
Rixste Frericks Joolingh (ca 1695-), in Onstwedde, Groningen.
Born ca 1723 in Vlagtwedde, Groningen. Trijntje was baptized in Onstwedde, Groningen, on 12 Mar 1723.