My brother tested Y-DNA in 2008 37 marker he matches 4 Rock surnames, and 1 Bartlett John Joseph P Bartlett/Barrtlett b 1909 (was adopted) my grandfather was not adopted but raised by foster parents b abt 1868 Indiana no records; I have done the autosomal DNA fmtree-June- 2016 what I am asking here this, will I also show a Rock and Barnett connection? I have found none so far but I have 6 matches on segments 4 @ 19 1 @ 20 and 1@21 just what does this mean?