Review and compare 25 and 37 marker Y-DNA test results for people with he Sadowski surname or similar. It is likely that multiple different families adopted the Sadowski surname because the Sadow origin is a place name - one who works in or near an orchard. From what I seen so far the frequency of the 12 marker results in the European population is high to obtain any valid information is limited. Even with the 25 marker results I match, with one difference, with a handful of others on FTDNA with different surnames. So, 25 and 37 marker tests are best.