This is an unused vintage 'real photo' postcard. It features a young man and his Pope bicycle. The stamp box is NOKO which is dated from 1907 to the 1920's.
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This one features a a man in a bowler hat. The back reads: Radium Studio, Muskegon, Michigan.
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There are so many options for this..
-- three sisters
-- mom - wearing black, recently widowed? and two daughters
-- older sister wearing black, recently widowed and two younger sisters. Maybe this was made to send to a man because they were all available to wed.
-- ?? who knows??