Macaulay Culkin says his 'Uncle Buck' co-star John Candy was the first person to notice his father was 'already a monster.'

John Candy's kids, Jennifer and Christopher Candy, tell EW they bonded with Macaulay Culkin during 'Uncle Buck,' as their father helped the child star through a 'tough situation' with his family.

In the doc, Steve Martin, who starred with Candy in “Planes, Trains and Automobiles” in 1987, shared that the comedian’s abilities were so impressive that it inspired Hughes to write “Uncle Buck” for Candy. Culkin first reflected on being several years older than Candy was when they worked together on the comedy.