No, I don't have any proof that Josiah and John were brothers. Philip Farber's will can be found on LDS microfilm #0890354, Tuscarawas County, Ohio, Will Records, Vol. 1-4, 1810-1864. John Farber and John Price were named as executors of his will. He states very clearly in his will, who each of his daughters married. I would like to contact your mother if you think she wouldn't mind.