I have a Peter Mroz in Chicago, married Maria Ostrowski
Aug 1903 in Chicago, possibly died in Nov 1914. I have a
copy of the death certificate for Maria/Mary Mroz but her
son Joseph who was the informant basically had no information on his mother. Didn't know her date of birth,
nor the names of her parents. Sorry for the delay.
Their daughter Anna Mroz married Joseph Lyp, son of Frank Lyp and Agnes Zawol in Chicago. Did your Mroz settle in Chicago?