I am not related, just helping:
From the Winnebago County Marriage Index:
REEL-IMAGE-DATE------BRIDE'S NAME----AGE-GROOM'S NAME--AGE
M915-0455 07/17/1915 PEACOCK, RUTH E 21 QUINN, FRANK J 25
This may or may not be the person you are seeking.
Contact the Winnebago County Clerk and state that you are looking for a "Genealogical Copy" of marriage records for this person and you have the microfilm Reel and Image numbers (above). Cost should be only $7.00. You will need to get a form, from them, and follow instructions furnished for identification.