Our Robert never lived in TN

I am looking for a Robert Parker also. I have a copy of a Will for Robert Parker dated 1817 in Allegany Co. MD. just across the Potomac River from WV. I am trying to find where my Robert Parker came from. In his Will he listed wife; Mary and children; 1. Benjamin, m: 10 Mary Fichter, 2) Rachel Ward, 3)Sarah Eliz. Nixon in 1834 she left MD about 1860 to Mt. Vernon/Danville Ohio 2. Nancy intermarried with Thomas Anderson 3. Mary Margaret "Polly" Parker m; 1st; Frederick Sapp Jr. 2nd; Thomas J. Porter (to Knox Co. OHio in 1820) 4. Robert Parker, ( Jr.) m; Margaret Miller 5. William Parker m: Drucilla Tomlinson ??? 6. Sarah Parker There was also a James Parker in (now) Allegany Co. MD. (would have been Frederick or Washington Co. MD until 1789) He married Elizabeth Neptor/Neptune ca 1800. As far as I know this Robert was not in AL. either. So many Parkers with so many Roberts!!! Anyone know of this Robert Parker or any of his family??? Happy to exchange info... Take Care Good Luck in your search PatH.