According to Patti Williams, NASM Archives, the Humphrey family was a big military family, and Marion and Joseph were the sons of General Charles Frederick Humphrey.
Album containing picture postcards. Some of the cards are reproductions of scenic photographs, while others are humorous or intended to be used as greeting cards, including Christmas cards. Some cards apparently are addressed to the Humphrey Family, including sons Marion and Joseph. Several cards are postmarked 1905 or 1906. There are four "real photo" postcards printed on photographic postcard paper.
Humphrey Family Postcard Album, ca. 1903-19076. Archives Center, National Museum of American History