Petite Maman

Nelly (Joséphine Sanz) has just lost her maternal grandmother. Her parents retreat to her mother's childhood home in order to empty it out. Nelly's mother (Nina Meurisse) is deeply upset by the whole process and leaves during the night without saying goodbye to Nelly.

Going out into the woods to play, Nelly meets a girl her own age building a fort. The girl, Marion, is extremely friendly and invites Nelly to help her. When it begins to rain, Marion takes Nelly to her home. After Nelly explains that she is visiting the area after the death of her grandmother Marion tell her that her own grandmother, who was also named Nelly, died recently. Going through the house, Nelly realizes that it is her grandmother's house and Marion is her mother. Alarmed she flees and is relieved when she returns to the house and finds her father in the present.

Nelly returns a second time to the woods and sees her mother again. They continue to build the fort. Nelly learns that they are the same age and that in three days Marion is set to have an operation to prevent her from developing the same illness as her mother. Returning repeatedly Nelly is able to spend time with her grandmother and learn things about her mother such as she harbours ambitions of being an actress.

The day before she is set to depart Nelly reveals to Marion that she is her daughter and comes from the future. To prove it she brings Marion to her grandmother's house where she reveals to Marion that her mother dies when she is 31 and that Nelly loved her deeply. The two are interrupted by Nelly's father who tells Nelly that he has finished with the house and wants to return in time for her mother's birthday. Marion asks Nelly to sleep over and Nelly convinces her father to let her stay an extra night so she can spend more time with Marion.

Nelly and Marion celebrate Marion's 9th birthday during the sleepover. The following morning Marion prepares to go to the hospital. Nelly reassures her the operation will be fine. Nelly also reveals that her mother is a sad person and she often wonders if it is because of her. Marion reassures her that she does not think this is the case. The two hug before Marion leaves for the hospital and Nelly returns home for a final time.

Source: https://en.wikipedia.org/wiki/Petite_Maman

Returning to her grandmother's house Nelly is surprised by her mother who has returned for a final viewing of the house. Mother and daughter hug.