This is a 1958 letter written by Lois Jarvis Graham to her sister Margaret Jarvis Overson discussing family matters (page 1) and the Jarvis Family Organization and Reunion (page 2).
And here is a picture of Margaret and Lois with their sisters Annie and Stella:
Standing (L to R): Annie Prior Jarvis Overson (1880-1968), Stella Jarvis Peterson (1883-1974), Lois Jarvis Graham (1894-1985). Sitting: Margaret Jarvis Overson (1878-1968).
They all had large families. Margaret had one daughter and eight sons, Annie had nine sons and three daughters, Stella had nine daughters and three sons, and Lois had four daughters and three sons.
Margaret, Annie, and Stella spent most of their lives in St. Johns, Arizona. Lois accompanied her mother Margaret Jarvis to Salt Lake City for obstetrical training and later returned there to nursing school and married a Scottish returned missionary named Hugh Graham and, as far as I can tell, spent much of the rest of her life in Salt Lake City.