Hi,Do you know what part of Philadelphia they lived in? I have Mackiewicz relatives from Bridesburg, not positive about the spelling. In the 1920 census I found: Mackievicz, Joseph - 38 yrs - Immig 1900-b.place Russsia with Steffie 32, Joseph 11, Victold 7 in 23rd ward ED 647 at 5040 James St. I know some info is different from what you have. I also found death record at St. John Cantius for Mackiewicz, Maryann in June 1916 and if this is your Maryann perhaps Joseph later married Steffie.Was their baby a Joseph too?
As for my family, I have a Jacob Mackiewicz married to Franciszk. I'm looking for Victoria Mackiewicz-someone told me she was a relation but I don't know how. I have more on other possible relatives...varied spellings if you know any other names you need help with.