Mark P. Ahern D.D.S., beloved son of Christopher and Mary Ahern; loving brother of Michael C. (Therese) Ahern, Daniel J. (Kimberly) Ahern, Maggie (Dan) Gaffney, Mary B. (Michael) Colaizzi; dear uncle of Katie, Jenny, Kevin, Ryan Ahern, Adam, Lauren, Genevieve Ahern, Meghan, Moira, Sean, Colleen Gaffney, Joseph, Brian, Timothy Rekruzciak; great-uncle to Anna and Billy Djikas. Visitation Sunday, 2 to 8 p.m. Funeral Monday, 10:30 a.m., from John Sheehy & Sons Funeral Home, 7020 W. 127th St., Palos Heights, to St. Alexander Church. Mass 11:30 a.m. Interment Holy Sepulchre Cemetery. 708-361-4235.