CANNES, France, May 22 (Xinhua) -- Canadian director Xavier Dolan, the youngest of the 18 selected in Competition, presented on Thursday his movie on the relationship between a mother and a son.

Dolan, who was born in 1989, tells a story of a widowed single mom, who finds herself burdened with the full-time custody of her 15-year-old son with the disease of attention deficit hyperactivity disorder (ADHD), in his new film "Mommy."

As they try to make ends meet and struggle with daily life, they meet their new woman neighbor Kyla, who is willing to help.

It takes Dolan five years to feature in Competition at the Cannes Film Festival since he shot his first feature "I Killed My Mother" in 2009. "Mommy" is the young director's fifth film.

Actresses who contributed to the success of his past films Anne Dorval, plays the mother Diane, and Suzanne Clement, plays Kyla, and the son Steve is played by Antoine-Olivier Pilon in the maternal eulogy.