- Born December 10, 1860 in Moretown, Washington County, Vermont.
- Parents were FRANCIS MONROE THAYER and HANNAH SOPHIA COLBY.
- Married EMMA H. DUPLESIS on September 22, 1888 in West Springfield, Hampden County, Massachusetts. She was born in May, 1873 in North Hadley, Hampden County, Massachusetts. Her parents were OLLIVER DUPLESIS and LYDIA.
- Married ANNIE E. CASEY McMAHAN on October 5, 1903 in Springfield, Hampden County, Massachusetts. She was born about 1864 in Ireland. Her parents were EDWARD CASEY and CATHERINE LENNIHAN.
- Died April 28, 1913 in Springfield, Hampden County, Massachusetts..
CHILDREN WITH EMMA H. DUPLESIS
- MAUDE A. THAYER, born June 26, 1889 in Palmer, Hampden County, Massachusetts.