EXCLUSIVE : Inga Ibsdotter Lilleaas is the quiet sister, Agnes, opposite Renate Reinsve ’s louder, more histrionic older sibling Nora in Joachim Trier ’s unbelievably brilliant Cannes Grand Prix winner Sentimental Value . “Agnes is the diplomat of the family,” Lilleaas tells us, “trying to keep everyone together in the family.”

Trier didn’t know much about Lilleaas before he decided to cast her as Agnes, an academic historian who lives with her husband and son in the spacious house in Oslo where she was raised with Nora and their late mother.

Their father Gustov Borg, played with a sort of wounded gusto by Stellan Skarsgård , is a once-famous film director who abandoned his family when he made the choice to concentrate on his career.

Sometimes, when I watch movies, my e

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