Nicolaas de Wit died in 1996. He was a son of Nicolaas de Wit (born 1881) and Adriana Wilhelmina Barth (born 1883). Gijsberta Kentie was a daughter of Barend Kentie (born 1875) and Daatje Adriana van der Tak (born 1877). I know that because both couples were my greatgrandparents too. The family De Wit lost contact with your aunt and uncle, but before his death my father Barend Kentie located them. If you're still looking for them, send me you e-mail-adress.