I am not a Dale researcher, but as part of another project I had gotten copies of any books I could find on him. Since most, if not all, are out of print and quite pricey, I thought I would give the genealogy info to be had from them.
From "The Life and Times of General Sam Dale" by Claiborne we have:
His parents were Scotch-Irish from Pennslyvania in the vicinity of Carlisle, but soon after their marriage(aboout 1773 -1774) they removed to Rockbridge County, VA. Sam was born there in the latter part of 1775.
They again moved to the forks of the Clinch River in Washington County, VA. and with nieghbors built a fort called Glade Hollow Fort.
Towrad the end of 1783 they moved to what is now Greensborough, Greene County, GA.
In Nov. 1791 his father bought land there 3 miles from Carmichael's Station.
The following Christmas(1792) his mother died. His father died one week later.
He was left the oldest of 8 brothers and sisters, one and infant at the time.
The only first names of any of these people he gives is a brother named Alexander.
Nancy Bell gives the name of a James Dale that was executor of his will, but whether this is a borther or nephew you will have to find.
He never married or had any children of his own. Any relations you might have will be through his parents before they left PA or these brothers and sisters, but hopefully this will give you a place to start looking for them.
I know from other research I have done that he spent many years in what is now Monroe County, AL (Burnt Corn).
Hope this helps someone.