The Summer of All My Parents(2016)

Overview:

After attempting to set a mailbox on fire, Pimpette, 14, and her elder sister, Joséphine, 18, spend their summer holidays shuttling between their secretly pregnant mom and bachelor father. But when Joséphine gets involved with the wrong crowd, little Pimpette turns out to be more responsible than the grown-ups who spend their time educating her.