Which famous actor plays the father-in-law to Ben Stiller's character in the movie 'Meet the Parents' from 2000?

Explanation

In the film 'Meet the Parents' from 2000, Ben Stiller's character tries to impress his father-in-law, played by Robert de Niro, but gets into all sorts of trouble along the way. De Niro is supposedly a florist, but is actually a CIA agent. The film became the first of three about Ben Stiller and his in-laws. Robert De Niro has been quoted for saying that he doesn't like to watch his own films - he even falls asleep to them.