Samuel junior's future wife, Frances Snyder (my great-great grandmother - married in 1853 at Roanoke County), is living with the Aliff family in the same 1850 census and is listed as 18 years old. Samuel's son, Rivercomb Jenkins, is my great-grandfather. Frances Snyder (Snider) Jenkins moved the family to Ohio as did her (cousin?) Susan Snyder who was married to Samuel Puckett. Samuel Puckett and Samuel Jenkins junior both served in the 42nd and both died. The Puckett family lived in Franklin County, Virginia in the 1860 census. Francis Jenkins' daughter, Mary, married Susan and Samuel Puckett's son, Samuel Puckett junior.
I visited the Confederate Cemetery, Univ. Va and Samuel J. Jenkins is named on the memorial statue located at the center of the cemetery. But his tombstone is among the many missing in the cemetery.
I hope this helps. If you have more to add, any information would be appreciated and I'll gladly share what I find in the future.
Priscilla