John C. Hart, 90, of Brea, a self-employed Realtor, died July 1, 1999, of cancer. Visitation: 4-9 p.m. with vigil 7 p.m. Tuesday, Coleman Chapel, La Habra. Services: 11:30 a.m. Wednesday, Our Lady of Guadalupe, La Habra. Survivors: wife, Mary; four sons; six daughters; 26 grandchildren; eight great-grandchildren.