August married Martha Wilhelmine Otillie Kadau Bef 17 Jan 1875, Bromberg, Bydgoszcz, Pozen, Germany. Martha was born 23 Jan 1853, Bydgoszcz, Pozen, Germany; died 22 Sep 1908, Pembroke, Renfrew County, Ontario, Canada. [Group Sheet]

1. Otto Ristau was born 20 Aug 1882, Prussia; died 3 Apr 1954, Pembroke, Alice, Renfrew, Ontario, Canada; was buried , St John Lutheran Cemetery Boundary Road, Pembroke, Ontario, Canada.
2. Ida Martha Ristau was born 13 Sep 1886, Alice Township, Renfrew, Ontario, Canada; died 11 Jun 1968.