OREILLY, Betty Jean -- Age 77, of Grand Blanc, died Thursday, December 23, 2004 at Genesys Health Park.  A Memorial Mass will be celebrated 11:00 AM Friday, January 7, 2005 at Holy Family Catholic Church, 11824 S. Saginaw St., Grand Blanc.  Those desiring may make contributions to the American Cancer Society or the Alzheimers Association.  Mrs. OReilly was born February 4, 1927 in Flint, the daughter of  John and Sarah (Evans) Yates.  She married Dennis F. OReilly May 27, 1950 in Flint. She had resided in Grand Blanc since 1972 coming from Flint.  She was a member of Holy Family Catholic Church, Flint Elks Lodge #222, Genesee Hills Ladies Golf League, Royal Quarter Social Group.  Surviving are:  husband, Dennis F.; 3 children, Dennis and wife Barbara of Linden, Kevin of Fenton, Bryan and wife Peg of Chester Springs, PA; 8 grandchildren, Courtney, Caron, Sean, Connor, Gannon, Sarah, Colin, Maggie; 2 brothers, John and wife Rosemary Yates of Grand Blanc, Bill and wife Phyllis Yates of Flushing; many nieces and nephews.  She was preceded in death by her parents; 2 sisters, Frances MacDermaid and Maxine Benton.  Friends may share their online condolences for the family at www.sharpfuneralhomes.com.