I did a lookup on disks that have Catholic and non-Catholic burials and did not find Raymond O. Hart or any Raymond Hart. Found a Pearl J. CALLAHAN who was born in 1902 died May 12, 1976 buried in Jefferson Barracks cemetery. I did not find Dennis there. There was a James MULLEN who was a member of St. Matthew Roman Catholic Parish in 1906. Maybe he is related to your MULLEN family. St. Matthew Church was/is located at 2715 N. Sarah St. Diane Shaw Hillsboro, MO