Friedrich Karl Siebert and Alwine Rademacher

My great-grandparents on my grandmother's side:
Friedrich Karl Siebert
born on 11 Aug 1874 in Hakeborn, Saxony-Anhalt, Germany.
He died on 04 Feb 1957 in Wendessen, Lower Saxony, Germany.
Alwine Marie Friederike Rademacher was born on 23 Jan 1875 in Warberg, Lower Saxony, Germany.
She died on 01 Oct 1956 in Schoeppenstedt, Lower Saxony, Germany.