John "Jack" S. Grabowski of North Riverside, age 91. Beloved husband of Joan, nee Kander; loving father of Al (Libby), Sharon (Matt) Mostowik and Linda (Tim) Bronsteader; proud grandfather of John Grabowski, Brian (Caitlin) Grabowski, Lauren (Justin) Rosenbloom, Jennifer (Steve) Gordon, Steve Bronsteader, Allison (Dariusz) Jarosz and Mike Bronsteader; great-grandfather of Olivia, Isabella, Weston, Walker, Kacper and Jaxon; dear brother the late Della (late Irv), late Ed (Pat) and the late Frank (Henrietta); fond uncle of many. John was a Member of the Holy Name Society at Mater Christi Church and was known as "John the Barber" for 47 years in Oak Park. Family and friends will be received at the Conboy-Westchester Funeral Home, 10501 W. Cermak Rd., Westchester on Thursday, January 15, 2026 from 3:00 p.m. until 8:00 p.m. Funeral Friday 9:15 a.m. from the funeral home to Mater Christi Church for a 10:00 a.m. Mass. Interment Resurrection Cemetery. In lieu of flowers, memorials to the American Cancer Society (www.cancer.org) appreciated. For funeral info 708-F-U-N-E-R-A-L.