Klaas was the second son of Deacon Abraham R. Reimer and his first wife, Helena, was a sister to Gerhard D. Doerksen. Klaas' second wife, Anna, was the daughter of Cornelius P. Friesen, and was born on the Atlantic Ocean while enroute to Canada in 1874. The Reimers lived on S.E. 22 all their lives. They were one of three families not to move out of the Blumenort village in 1910. Klaas was a very active and prosperous farmer, owning much land in Blumenort, Ekron, and as far away as Vassar and operating a large dairy. He also operated a blacksmith shop. He is remembered as and outspoken and independent man. He was one of the first in Blumenort to buy a gas tractor and drive a car.

-from Blumenort: A Mennonite Community in Transition, 2nd Edition, by Royden Loewen, p. 303.

Immigration: 17 Jul 1874, S. S. Austrian; arrived Quebec City, Quebec

1st marriage: Doerksen, Helena, 10 Apr 1862
Married: 12 Nov 1882; Blumenort, East Reserve, Manitoba

Children:
1 Reimer, Helena D., 6 Aug 1884
2 Reimer, Maria D., 12 Aug 1885
3 Reimer, Abraham D., 22 Sep 1886
4 Reimer, Anna D., 18 Jun 1888
5 Reimer, Klaas D., 2 Jun 1889
6 Reimer, Gerhard D., 29 Aug 1890

2nd marriage: Friesen, Anna K., 15 Jul 1874
Married: 26 Nov 1893;

Children:
1 Reimer, Cornelius, 25 Sep 1895
2 Reimer, Peter F., 19 May 1898
3 Reimer, Agatha, 21 Oct 1899
4 Reimer, John F., 10 Jun 1901
5 Reimer, Agatha F., 11 Jan 1903
6 Reimer, Elisabeth F., 22 Feb 1904
7 Reimer, Heinrich, 22 Apr 1907
8 Reimer, Margaretha F., 3 Dec 1908
9 Reimer, Katharina F., 18 Jul 1910
10 Reimer, Martin, 20 Dec 1912
11 Reimer, Susanna, 28 Aug 1914
12 Reimer, Heinrich F., 27 Sep 1915
13 Reimer, Susana F., 3 May 1917
14 Reimer, Bernhard F., 2 Feb 1922

Parents:
Father: Reimer, Abraham R., 3 Sep 1841
Mother: Poetger, Helena, 3 Aug 1841