>I sent off my father's test a few days ago to AncestrybyDNA. I chose
>to do the biogeographical admixture test first because my Dad is the
>last of his father's children and I wanted to detrermine the degree of
>European ancestry (his father was purportedly 1/2 white) and to
>confirm or preclude any Native American ancestry (oral history).

>Question 1: My GF had four families. All the lines are almost femaled
>out. Should I also test my uncle's son from another of the families to
>compare to my father's results? Should I expect any differences?

I am certainly no expert on DNA tests, but my understanding is that the biogeographical admixture test can differ between siblings. That surprised me, but it makes sense.
But with the Y-chromosome test, all of your grandfather’s sons (and their sons) should have the same Y-chromosome as your father. That won’t give you degrees of ancestry, but if it tests as a European Y-chromosome, it would confirm a European progenitor on that line, but not in what generation it occurred.

>Question 2: I am searching zealously for male descendants of the the
>overseer who I am hypothesizing father my GF. If not him, one of his
>four sons. I'm close, real close. Traced family to Texas 1900-1920s.
>Haven't found a male descendant of a male descendant yet but hoping.
>Now, if I should find one, and assuming he agrees to be tested, will
>this definitively confirm or exclude paternity?

Based on my understanding, the Y-chromosome test can eliminate paternity, but cannot confirm paternity. It can confirm a relationship. Just recall the Thomas Jefferson results. One line of the Hemmings descendants match the Y-chromosome of Jefferson’s cousins, so it is acknowledged that that child was fathered by someone with a Jefferson Y-chromosome. But there is still no agreement as to which Jefferson it was.

>Question 3: Do you know of any company that tests hair? My mother's
>brother (the last male on that side of the family) died before I
> could do a test to determine amount of European and Asian ancestry.
> I have a hair samples.

I don’t know of a company that does genealogy testing on hair samples. However, there are companies that do forensic dna testing. I did a search for “dna hair sample” and did get a few results, most of which were for animals. The forensic testing is more expensive than the genealogy testing from what I can see. Trace Genetics does both genealogy and forensic tests. See www.tracegenetics.com

>Question 4: Is the African ancestry test worthwhile? Almost everyone
>I've talked to is descended from the Bameleke. Is their sample large
>enough at this point?

My test came back as the Tikar people of Cameroon, and Melvin Collier’s came back as Fulani, if I recall correctly. Here is a link to an explanation of their database: http://www.africanancestry.com/databasemain.html