I've read a few articles abt DNA testing and its uses in genealogy; however, I'm still lost and hoping someone can point me in the correct direction. I wd like to determine if my father's grandmother, Emily Etta McCoy, is related to John Carliss McCoy. A male descendant of John McCoy submitted his test results a few years ago. Which DNA test shd I take that wd correlate with his? Any advice wd be greatly appreciated.