Ok, here is what I can find on your family.On the 1920 Soundex I find the following children living in the home of Elizabeth McCarthy (their grandmother): Roy Wage 3 b. in IL Jackage 2 b. in IL Mrs Mae Mummert age 24 b. IL Mae is obviously the mother, maiden name probably McCarthy.The father is probably deceased. The McCarthy address was 2837 8th Ave., Rock Island, Rock Island Co., IL.
As I previously stated, I do have "another?" Roy W b. 16 Jul 1916 and d. 3 Jan 2000 of Plainfield, IL (from SSDI - 342-12-9222).An obit for this person was listed in the Obituary Times on the web - from the Plainfield Harold News of 6 Jan 2000.
I would recommend getting either the obit, death cert or the SS application.The death cert would most likely have his parents as should the SS application.
Let me know if this helps or if you find more. Bob