Jane,
According to my cemetery records, Yes, they all are buried in Ponca City IOOF Cemetery

James Lee Speer b. 2 Mar 1885 d. 1 Dec 1955 Block 5 Lot 11 Space4
Mollie B. Speer b. 9 Apr 1883 d. 1 Sep 1959 " 5 11 5

These may be yours too just in case,

Jasper L. Speer b. 28 Jan 1887 d. 14 Sep 1966 Block 5 Lot 9 Space 99
Ethel J. Speer b. 20 Aug 1891 d. 6 Jan 1958 5 9 98

Since Jasper b. age is 2 yrs. younger than James, could be a brother. And Ethel is Jasper's wife.
I do not find that any of the above were married in Kay Co.
Hope this will help, at least a little.