- Walter E. Libby (1871-1934), letter writer
- Lucie C. (Mack) Libby (1885-1957), letter recipient, Walter's sister-in-law, wife of George Everett Libby
- Father, presumably widowed George Raymond Libby (1848-1925)
- ? - perhaps George; if so, perhaps Lucie's husband George Everett Libby (1881-1943)
Transcription at the end of this post - if you have corrections and/or information to share, please leave a comment for the benefit of other researchers.