Researching my Adopted Grandfather #dna


Connie Fisher Newhan
 

I've been trying to research my maternal adopted grandfather Henry ABRAMS for 40 years.  I have come up with nothing.  I reached out to my first cousin, the only person left who is male and carries my maternal grandfather's surname. 
 
It turns out he did Family Tree DNA years ago, as did my brother.  (My cousin is not really interested in research. He did the test at his wife's urging)
The curious thing is neither my brother or cousin show up as a match for each other, yet my mother and his father were siblings (both born to my adopted grandfather and the same mother)
 
How is it possible there are no matches. Would they have had different DNA tests?
 
Also, my cousin received a letter from the WIRTH Project telling him he is likely  related to others on the Y-DNA group J-L556.  
 
Any ideas?
Best Regards,
Connie Fisher Newhan (#1272)
California,  USA
FISHER/FISCHER/FISZER, FISZEL (Warszawa& Bedzin, Poland),S(Z)PRINGER,
KOKOTEK, HERSZLIKOWICZ, HAMBURGER (Bedzin, Lagiza, Zarki, Poland), GERSTEN
(Obertyn, Galacia) BARSKA/BARSKY/BARSKIY(Odessa), GOLDBERG (Sokolka?), FELDMAN
(Veliuona,Kaunas), CAHN (Koln), FRIEDSAM (Bodendorf, Sinzig Germany,
Pittsburgh,  PA), NEWHAN/NEUHAN/NEUHAHN (Hesse Cassel, Meimbressen, Germany,
Baltimore, MD),  BOHORODCZANER (Potok Zloty, Ukraine), LEVINE,
ROCKOVITZ, ABRAMS (Finland?),  

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