Hi Craig; According to my records William C. Cosman b.1850 and Adeline Cosman b.1844 were the children of William M. Cosman and Esther Caverly of Newburgh New York. They had several other children, one of which was Hannah Elizabeth B. 1836. I wonder if she is the Elizabeth that was living in the same house in 1875? Hannah was married to John Ward Wygant as opposed to William C. Rodman. Could she have been married twice? If you have any further information, I would be glad to research this further.