Yes, it sounds like we have ancestors in common. My grandmother, Aniela, arrived in Youngstown, Ohio. I didn't know anything about her brother, Andrzej. Aniela did meet and marry my grandfather, Andrzej Niklowicz. They later moved to Michigan.
I don't know anything about her brother "living horse in skin". Sounds interesting, though.
I am so happy to hear from you!