The engagement of Diana Elizabeth Mendley to Lewis Steven Ingall has been made known by her parents, Mr. and Mrs. Mark Mendley of Bronxville, N.Y.

Their engagement was made known by the prospective bride's parents, Mr. and Mrs. R. Chase McDaniel 2d of Haverford, Pa.

One who had said on Wednesday that Mr. Aquino was "totally harmless" and "never showed any anger," said today that she knew nothing of the 1991 assault cases and felt "betrayed" by Mr. Aquino's parents for not telling her.

Their engagement has been made known by the prospective bride's parents, Meredith Evans Hallowell of Harrington Park, N.J., and Peter Sand Hallowell of Mahwah, N.J., and Nantucket, Mass.

Their engagement was made known by the future bride's parents, Mr. and Mrs. Caleb Brokaw of New Canaan, Conn.

Their engagement was made known by the future bride's parents, Louise I. Peck of Locust Valley, L.I., and Andrew F. Peck of New York.

The couple's engagement was made known by the future bride's parents, Margaret Williamson Parker of Hoboken, N.J., and Jacques William Parker of New York.

Their engagement has been made known by the future bride's parents, Mrs. Hadley Comstock Ford of Bronxville and David Procter Bell of Wilton, Conn.

Martin of Wilmington, Del., and the late Mr. Martin, has been made known by her parents, Mr. and Mrs. Raymond D. Vlasin of East Lansing, Mich.

LEAD: September wedding plans for Catherine Woodbury Wattles and Peter J. Barnes 3d have been made known by her parents, Mr. and Mrs. John C. Wattles of Kalamazoo, Mich.