Hi, I've found the following in Vol. 1 of "The Merwin Family in North America"
Pg. 742 3433.Elmer W. (9) Merwin b. dec 6, 1906, (V.R.), in Blenheim, NY,; living in 1970 in Sharon Springs, NY, a son of William & Emma (Hogabloom) Merwin.On Sept. 12, 1932 (V.R.) mar. in Stamford, NY, Blanche Irene Rivenburgh b. abt. 1914, in Colchester, NY, a dau. of George an dAnna (Henness) Rivenburgh, by whom he had eleven children:
Edward George b. Feb 4, 1933 in Harpersfiled, NY Betty Irene b. Aug 2, 1934 in Davenport, NY Robert Allen b & d May 30, 1936 in Davenport, NY Elmer Burton b. Apr 3, 1937 in Harpersfield, NY Mildred Catherine b. May 3, 1939 in Fulton NY John Edelbert b. Mar 21, 1941 in Davenport, NY Dorothy Anna b. Apr 29, 1943 in Oneonta, NY