Ruth You asked me about Mary Brown's family who is married to John Hogg Prentiss.Well I got to looking up copies of a book we copied information in Antrim, NH.Looking at what I had on William Brown, who is Mary Polly Brown's father. He married Mary Lampson who lived 102 years and 6 months. Children listed is Joseph,Samuel, David, William, John Daniel, Sarah, Hannah, Betsy, Polly, Nancy, Mehitable.He moved to Rochester, Vt. 1802 and died in Hancock, Vt. 6/10/1828, Wife died 7/1861. (The book was Genealogical Records of Antrim, New Hampshire Families.)William was brother of the first brother of Antrim, came from Deering to Antrim. Hope this helps, or maybe you have already.