PS: I ran a quick search at rootsweb and was surprised at how many people were researching this line and how split they were on the mother.
# ID: I433
# Name: Mary HARTMAN
# Sex: F
# Birth: 1778 in Virginia
# Death: 1839
# Change Date: 5 JAN 2002 at 20:13:18
None seem to offer any real evidence on her.