Catherine Lozaw Shawger (b. 1816) and William H. Lozaw (b. 1833/4) were siblings. They were both children of Francis and Anna (Ocobock) Lozaw.
Anna's parentage has not been proven definitively, although her maiden name is definitely Ocobock.
I have been researching the Lozaw family for nearly 13 years; feel free to e-mail with further questions. In time I will have some information posted to my website; when I do, I will post a link here.