He calls her Auntie, but I don't think he's her nephew. They are related though.
Here it is in a nutshell.
Edmund Freeman was born in England in 1590, but came over by ship (The Abigail) in 1653 and settled in Lynn, Massachusetts. Five generations later, Lewis and Catherine Freeman had seven children, including twins Ada and Ida, born in 1854. Ada Freeman married Seth Henry Bliss. That's where the relationship between Freeman and Bliss comes in, but William S. (born in 1862) is not one of their children, so he must be a nephew of Henry Bliss. In that case it's especially sweet of him to send a card, don't you agree?
Mrs. Freeman appears to be Florence Peek Freeman, born in about 1850 and married to George Lewis Freeman, a Baptist and a Free Mason who lived in Schuyler Lake, Exeter, Otsego County, New York.
Here's a photo of the Exeter School in 1915, courtesy of the Exeter Historical Society.
Teacher, Gussie Brainard, Hobart Curtiss, Gladys Truman, May Wilson
next row: Leslie Curtis, Bernice Chappell, Truman Allison, Ferris Bliss, Julia Bliss, Joe Allen, Pearl Bliss
Here's what Schuyler Lake looks like today. It's still very rural. Wait a minute...is that the Mason's Lodge?
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And if it happens to be your birthday today, I hope it's full of bliss and happiness.