Hello,
I am doing genealogy on my great grandfather. His name is John Henry Collmann born in oldenburg 20 January 1883, he had a brother Cornelius Frederick Collmann born, 5 October 1885. Father name is Garret collmann, Mother's name is Cristine Janssen she died in germany possibly by her husband Garret Collmann. Both boys left germany in 1887. Thanks Holly Staples