Mary Wallis (married to Zachariah Webb) was a widow at their marriage. Wallis was her married name. I got this from North Carolina marriage bonds records. There is a good book about the Douglas family that mentions Zachariah and Mary's daughter, Elizabeth. It is called The Dougalss Genealogy, by Mary Lois Douglas Forrester, published in 1992 by the Genealogy Publishing Service. There are photos and copies of documents in the book. I obtained a copy several years ago. The DAR no longer accepts membership based on Alexander Douglass's service. They say the records connecting him as Frederick Douglasses father are too suspect, and do not prove him as the father with certainty (I was still able to join through my great grandma Douglas's family, just through her mother's mother--the Aldermans). Stephanie Varney