I found a Mary Schutz, but the age and siblings don't fit:

Mary Schutz, age 76 of Evanston, beloved sister of Helen and the late John and Martin Schutz. Funeral Mass Thursday, 10 a.m. at St. Nicholas Church, 806 Ridge Ave., Evanston. Interment St. Mary Cemetery, Techny. No visitation. UN9-2900.
This was in the Chicago Tribune, July 6, 1982