I'm still searching for Wincenty/Vincent Proszogulowicz's (the father) obituary -- I came across one for Alexander Proszygotowicz, son of Wincenty Proszygotowicz. I think this is another son of Antonina and Wincenty -- with a typo of a t instead of an l in the surname. (See attached.)
He would have been born c. 1915.
IF this is their son, then we have an address for them. I checked -- There was such an avenue as "Short Clinton."
So many of the burial places have been at St. Hedwig's (including this one.) I think that that Wincenty is probably buried there.