Vasili Adam Skorupodski
1. Vasili is a Russian name. It's unlikely that someone living south of Kraków would have a Russian first name as this area was a part of Austria-Hungary for over 120 years.
2. Currently, no-one in Poland uses the name Skorupodski. The name could be invented or misspelled. 3. Mary Skorupodski: First name is English. Why would anyone living near Kraków have an English first name? Polish equivalent of Mary is Maria, a typical Christian name. Jews would rarely use it.
So far the story doesn't make much sense to me.
It's difficult to judge one's religion by clothing they wear, unless one wears, say, an ultra-orthodox jewish garb. In Fiddler on the Roof, Jews wore typical clothing of the time plus undergarment called Tzitzit, the strings found at the side of Orthodox men.
If they were Jews living in Austria-Hungary they would most likely have a German second name. That's because Polish Jews did not use second names until the second half of the 19th century. They were forced by the Austrians to buy German-sounding names from the list provided to them by the imperial authorities and use them.
All in all, bearing in mind that the story looks fictional to me, they were unlikely to be Polish Jews.