On the 1930 U.S. federal census they are in Chili, Monroe Co, NY:
MITCHELL, John age 52 b. Canada/English, immigrated 1925 wife Annie E. age 45 b. Canada/English son Carey C. age 21 son Ross W. age 19 son R. Glenn age 18 dau Constance M. age 13 son Donald C. age 11 dau Shirley C. age 5
There's a birth record for Rodger Glenn MITCHELL, born 27-May-1911 in Hamilton, Wentworth, ON, son of John Wesley MITCHELL and Annie Ethel CAMERON.
There's a border crossing record for Carey Checkley MITCHELL, born Hamilton, Canada on 19-Sept-1908, son of John and Annie.Bordering crossing on 7-July-1925.
(There's a birth record and border crossing record for a Roger O'Connell MITCHELL, but his parents were Lorne William MITCHELL and Marian A. STANWAY)