Unfortunately, all the info I have on "Black Sam" Brewer is in the Paint Rock Valley Brewers booklet that you already have. My g-g grandfather, Emberson Jerry Brewer, was Sam's brother, also. I didn't see your g-g grandfather, Jim, listed in the booklet. Was Jim a nickname? The ten siblings I have listed are:
1.George W 2.William L 3.John 4.Charles B 5.Solomon 6.Samuel "Black Sam" 7.Emberson Jerry(my g-g grandfather) 8.Lucinda 9.Rebecca Jane 10.Richard Henry
My line descends as follows: John Brewer/Mary "Mollie" Frazier Emberson Jerry Brewer/Martha Jane Pogue Richard Harvey Brewer/Mary Mable Harbin Martha Eloise Brewer/William Thomas "Red" Davis (these are my grandparents)
I have possible leads as to John Brewer's ancestors that go back to 1600's London, England but I'm still trying to verify the info. Hope this helps. Happy to share anything I can. Look forward to hearing from you.