I have George Allender, father of Dennis and John L, as son of Jacob and Christina as shown by the 1850 census for Morgan County Virginia, and the close fit of records in that line. Jacob is son of William and Crestine of the Moveables Plantation, a line that does not show a connection to the MD Allenders. I have not found much new on the MD Allenders. Most of my sites are public and I am happy to share directly as well.