Frank J. Tremmel, 80, of Darien, at rest September 2, 2022. Born September 23, 1941 to Francis and Mary Tremmel. Beloved husband of Janice nee Dalton; loving father of Patricia (Donald) Schuman and Frank Tremmel Jr; dearest stepfather of Donald Ostrom Jr., David (Liza Schaafsma) Ostrom, Allison (Nickolas) Briglio and Erica Ostrom; devoted grandfather of Kurt (Lynne) Ostrom, Emily King, Molly and Lily Schuman, Jennifer and Nickolas Briglio and Huck Tremmel; dear great grandfather of Charlie, Oliver and Leo; fond brother of the late Mary (the late Tom) Jareczek; uncle of many nieces and nephews. Visitation Monday September 5, 2022 from 2-6 P.M. at Cappetta’s West Suburban Funeral Home 39 N. Cass Ave., Westmont. Interment private. Inlieu of flowers memorials may be made to St. Jude’s Children’s Hospital at stjude.org or Disabled American Veterans at dav.org  Info 630-852-8000 or www.westsuburbanfh.com