His father's name is given as hersch leib. However, as far as I know that was the name of his wife's father. It is possible they both had the same name, but the use of the name Szimcha Israel seems to indicate he was a brother of Szimcha Israel:
https://www.geni.com/family-tree/index/6000000195756161836
Thanks for any insights you can provide.
Yaakov
