The death of his beloved older brother Joe ( Kyle Chandler , seen in many generous flashbacks) saddles him with the unexpected responsibility of raising Joe's only son Patrick ( Lucas Hedges , Redford from " Moonrise Kingdom ").
He’s all the kid has left, unless you count Patrick’s two girlfriends (Anna – daughter of Mikhail – Baryshnikov; and Hedge’s “Moonrise Kingdom” costar Kara Hayward), whom he hilariously tries to juggle between hockey practice and rehearsals with his aptly named garage band, Stentorian.
The highlight of the film is the performance from Hedges, a young actor who got his start in “ The Grand Budapest Hotel ” and “Moonrise Kingdom.”
Affleck has a terrific foil in the 19-year-old Hedges (“Moonrise Kingdom,” “Kill the Messenger”), playing Patrick as a ball of rowdy, tempestuous adolescent energy who nonetheless submits with surprising ease to his uncle’s instruction, as though recognizing his need for an authority figure in his father’s absence.
And Kara Hayward, best known as the female lead in Moonrise Kingdom, plays one of Patrick’s two girlfriends.
Patrick bounces between a pair of high school sweethearts: the affably pretentious Sylvie (Kara Hayward, whom you may recognize as the now-post-adolescent girl from Moonrise Kingdom) and the earthy chucklehead Sandy (Anna Baryshnikov—yes, she is the Baryshnikov’s daughter).