The info on William L. is correct but have never found any reliable reference to his father's middle name or family info. No info on the mother and possible sibs of William L. either and would really like to have that info.
There are several trees who have mixed the elder William (1805) with William Thomas Dunn's family. He married Phadran Hanks and (from memory) was the s/o Benjamin in Alabama. However, these are two different Williams.
Should you find anything on William (1805) that is documented, I would appreciate knowing and will likewise let everyone know should I find anything.