Yisroel Shmuel Rubin - searching for relatives who know something

I would like to know more about Yisroel Shmuel Rubin, the father of my gandfather, Menu Rubin. I believe he was a religious Jewish scholar and wrote at least one book, but I do not know much about him. His son Menachem Eliezer, my father's father, whom my father's cousins referred to as Menu, was the town shochet Iritual slaughterer) in Sighet, Romania. Menu was killed in Auschwitz, but his brother Gershon survived the war and came to the United States. If anyone knows anything more about Ysiroel Shmuel Rubin, please contact me.

Haya Rubin