The 42-year-old congratulated his sister Maggie Gyllenhaal's husband Peter Sarsgaard on his best actor win at the 2023 Venice International Film Festival over the weekend for the movie Memory.
Alongside a snap of the star with his award, Jake's tribute read: “Congratulations to my incredible (and incredibly talented) brother in law @gaardsars for winning Best Actor at the Venice Film Festival!"
He added, "Couldn’t be happier for this extraordinary human. Love you brother.”
Maggie, 45, also celebrated her husband of 14 years on Instagram, writing, “My husband @gaardsars won the #volpicup BEST ACTOR at the Venice Film Festival last night. His performance was astonishing. Vulnerable, feet on the ground/heart in the heavens.”
Meanwhile, the Gyllenhaal siblings’ godmother Jamie Lee Curtis shared the same image as Jake and wrote of Sarsgaard: “SUCH A GOOD MAN, HUSBAND, PARTNER, FATHER, ARTIST!”
Sarsgaard, 52, who shares 16-year-old Ramona and 11-year-old Gloria Ray with Maggie, took home the award for his portrayal of a man with dementia in the movie Memory, which also stars Jessica Chastain.
When the actor stepped up to the podium to accept, he made sure to reference the ongoing writers' and actors' strikes that brought almost all of Hollywood to a standstill. He also paid tribute to his wife, telling her, "I love you."
Sarsgaard concluded by sharing his personal connection to his role in Memory, revealing that his uncle suffered from dementia and died during the pandemic.
Cailee Spaeny won the best actress award at Venice for playing Priscilla Presley in Sofia Coppola's Priscilla.