We're about ten years into a family Y-DNA project with a total of 20 individual profiles stretched over three generations, and the results indicate our Y haplotype has not varied more than a marker or two over more than ten generations - possibly as much as twenty generations. Our collection of profiles represent individuals who descend from three different Reber immigrants to the US in the years 1738, 1880, and 1912. It follows that the common ancestor to all three lived in Germany sometime before the year 1700, possibly long before.