This Ninian Beall is very well-documented. He is my direct ancestor via his daughter Sarah Beall who married Samuel Magruder. However, here on Geni they have Samuel's wife as Sarah Mills, which I haven't foundy any documentation for.
Ninian 'should' be connected as the maternal grandfather of:
Ninian Magruder
Clearly Ninian Magruder was named for his mother Sarah's father. I started a Discussion under this tab related to this:
Ninian Magruder#/tab/discussion
but there is no profile for Sarah (Beall) Magruder for me to attach the documentation I've found to, so I'm going to go ahead and add the connections to this profile for Col. Ninian Beall so as things get corrected as far as Sarah Mills vs. Sarah Beall is concerned, there will be a profile for Sarah Beall to attach as a wife of this Samuel Magruder:
Col. Samuel Magruder
It'll all make more sense once I can add the documentation for Sarah Beall and Samuel Magruder.