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BobOne of the advantageous of being a SABR member is access to GeritageQuest which has online records of many years of the US Census, 1910 included. The youngest male Swift I could find in Philly or NYC was an Ira Swift who was 16 and lived in Ward 16 of Manhattan NYC. Not sure where ward 16 is/was. Would be interesting if it included 23rd St. Ira was a message boy and his father was a tailor in a department store.
Probably not him, 16 is a little old, but kinda fun.