Charlie Matthau directed his father in The Grass Harp ( 1995 ) .
His grandchildren include William Matthau , an engineer , and Emily Rose Roman , a student at Binghamton University .
Charlie Matthau directed William Matthau 's father in The Grass Harp ( 1995 ) .
His grandchildren include William Matthau , an engineer , and Emily Rose Roman , a student at Binghamton University .