I only see 2 Czugala surnames listed in the Social Security Death Index. Pete and Helena
Your grandfather's surname is in the database here:
Yes, Piotr & Helena were my grandparents.
The straty.pl website is amazing, I am going to write down as much info as possible.
Piotr had a sister Anna (that we know of), and his parents were Jan & Teresa (unsure of surname). Helena's surname before marriage was Bukowski, and had brothers Joseph and Merion. Her parents were Jan & Anna (unsure of surname).