I don't really know where Skempa is in Poland, but judging from Census data (Ger/Poland), it was in Western Poland. This could be Skepe?
I don't know if Peter had any siblings. I have NO other information, though I will be going back to my mother's home this Christmas and will hopefully turn up more infor from old documents.
Peter's son Stanley moved to Pittsburgh, PA where he married Harriet Malankiewicz around 1921. She was from Stzryzow in southeastern Poland (Galicia/Poland).
Kim, If you want information of Peter's children and their families, I can get this. Lets stay in touch.