Chaya Pesah Grundstein (Mirel) - Chaya's Brother.

Has anyone learned of Chaya's brother's name? Or researched this hospital? I'm trying so hard to connect Chaya to my gr gr Grandfather who was born in 1884 (Mazowieckie Poland). His name is jacob Mirell. He had an older brother Louis, three younger sisters Rebecca, Anna, Maria and two younger brothers Solomon and George. All but Solomon and George were born in Poland. Their father was Aron Mirell and he married Rebecca. Her last name is possibly Bronner but I have no proof of that, only what my cousin found.