Looks like Catherine Elizabeth predeceased Richard. You could try contacting the funeral home, parish or the cemetery for information on Catherine and Grace.

The Washington Post January 15, 1941
Powers, Richard J. Sr. On Tuesday, January 14, 1941, Richard J. Powers Sr., husband of the late Catherine Elizabeth Powers and father of Raymond J., Walter F. And Richard J. Powers Jr. Services at the S.H. Hines Co. Funeral Home, 2910 14th Street Northwest, on Thursday, January 16 at 10AM, thence to St. Gabriel Catholic Church, Grant Circle, where mass will be offered at 10:30AM. Interment Mount Olivet Cemetery.