Dear Ezra,
Looking at your tree it appears that someone has given your patriline the identification of: Haplogroup Q-M242 / Q-Y2754 Y-DNA (in the about section of your father's profile and in the pedigree up to Moshe (Movsha) Magid). Do you know how this Q-M242 identification came to be associated to your pedigree?
From the GENI tree it appears that Moshe Magid is the patriline great grand nephew of HaGRA. If all of this is correct and verifiable then it seems that indeed HaGRA is a Q-M242. Can you please cite the Maciamo Hay paper?
If this above holds true than you yourself may be a patriline relation of HaGRA. Have you done your yDNA testing?
Cordially and Appreciatively,
Adam
From old research and family oral history, I know for sure and am referenced in Chiam Friedman’s book I am the 8th great granddaughter of the Vilna Gaon. I have over 25 years, gone way back in threads and know I am also a very distant great grandfather who was Davidian . I have more information that dates back to the first judge and other very interesting stuff.