Looking for descendants of John Davis Parker born about 1805

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My name is Dale Parker Bogdan, my father was Dorsey Lewis Parker Jr,(1924-2009) and my grandfather was Dorsey Lewis Parker, Sr. (1888-1959) My grandfather was the last child born of Jonas Parker (1828-1890) and Mollie Brooks. Jonas' father was John Davis Parker (1805-1868). Jonas married 3 times and had 13 children, total. I am unable to trace my line any further back than John Davis Parker. As far as I know, John Davis was born on Maryland's Eastern Shore and lived in Dorchester County. He is buried in Church Creek. Jonas was born in Madison, also on Maryland's Eastern Shore, and lived there his entire life. My grandfather, also, was born in Dorchester County, but, because his parents died when he was very young, he eventually came to live in Baltimore City where he married my grandmother, Elizabeth Brundrett, in 1913. I have looked through this blog but can't find any names that I recognize. Any help would be greatly appreciated.

[Edward Gerald Willey Jr]

John Davis Parker is my 4th great grandfather. I too have hit a brick wall and cannot find anything about his parents. I'm on Ancestry.com under the username of edwilleyjr. Here's how I connect.....John Davis Parker > Jonas Parker > Clifton Jonas Parker > Stewart Orion Parker > Audrey Olivia Parker (Married Edward Willey) > Edward G Willey > me.