Hi: This isn't my line but could this be your John Delahay?

Census 3rd District July 18, 1860, 992/872 St. Marys Co.
John Dillahay 38, a farmer & his wife, Anna C. 19,
John D. 1
Emely Hayden 40 yrs ,Harriet Cooper 35 a black female,Mary O. (No last name)age 9

Mary Emily Hayden, 74, d. 28 July 1883 at res of John Dillahay in 3rd dist. Beacon 8/29/1883

I have John as a possible son, of Judith S. born 1787 in Charles Co., Md and died after 1860 census when she was living with her son, James