We are talking about 2 different Antonis', though they could still be of relation. I previously never asked my grandfather if his dad had siblings and when I received your message, I asked him (he's 96 but a sharp memory). His dad, Antoni, had 2 sisters Mary & Michalina here in the states as well as a brother in Poland. I found out from a cousin his name was Piotr. There may be other siblings who stayed in Poland, but they don't remember any other names. Antoni's parents were Joseph and Mary Ann. There is a possibility that Joseph's sibling is your ancestry line. My Antoni was born in Wizny or Wizajney Poland but I found a record that Joseph was born in Grabkow.