You ask a very valid question. All males pass on their DNA to their male offspring. This DNA is remains unchanged for many many generations. I can best illustrate this by outlining my own DNA confirmation. I had long speculated that three Lumpkins brothers had moved to Kentucky from Virginia. These three assumed brothers were William, Joseph and John Lumpkins. I could find no proof to tie these three together other than circumstancial evidence. I finally found a descendant of Joseph Lumpkins who elected to have the DNA test done. The result of the test verified that we were exact matches even though we were 5 generations apart. The other consideration is the fact that the only way to prove that you descend from anyone is through DNA since we have no way to know if an ancestor was either unfaithful or adopted. I hope that you can help the Lumpkin(s) DNA project by convincing a male Lumpkin(s)relative to participate in our Lumpkin(s) DNA project.