There is a Dean Bishop who married Polly J (surname unknown). She died in Salisbury in 1949. Dean is shown as 29 yrs. old in the 1850 census in Salisbury - alone. He married 2nd, Maria Lucas and in 1860 census he is in Sharon, CT with their children, Jane, age 2 and Maria, 10 months Also living with them is a Sheldon Bishop, age 48 who was born in New York (I'm assuming Sheldon is the older brother of Dean). After researching Sheldon, I found out Sheldon was born in Northeast, NY. There is a Dean Bishop (I'm assuming Sr.) in Bethlehem in the 1800 census then in Northeast NY in 1820, 1830 & 1840. This Dean could be the father of Sheldon & Dean (amongst others). Taking this information into account, it looks like Dean b. ca 1821 was born in either Northeast NY - or possibly CT since it seems the family traveled back and forth. Dean's second wife, maria applied for pension in 1866. It also shows she was guardian of M Pettit. It looks like Maria (mom) married Thomas Pettit of Bridgewater after Dean's death, and their daughter (Maria, age 10 months in the 1860 census) may have been adopted by Thomas Pettit.
Hope this helps you in continuing the search for the information you need.