John Vencelen and Isabella's family

Looking for members of John V. and Isabella J. Bonstein's family; They married 15 Sep 1875.Children:
Laura B. 12 jun 1877 D. 27 Feb 1939
Mary B. 2 Oct 1878 D. 24 Dec 1965 Married 24 Dec 1901.
John V. Jr. B. 13 May 1880 D. 10 Jul 1897
Curtain B. 28 Sept 1881 D. 11 Apr 1940
Maholn B. 5 Oct 1886 D. 17 Oct 1957
Emma B. 1888
Any info greatly appreciated.
Biblgirl@aol.com