The History Student

The History Student is a 2015 Irish-Polish film directed by Graham Jones about a seven-year-old boy from Dublin who is spending a rural summer holiday in his mother's native Poland and on strict instructions to speak only that country's language - when he finds the words to ask where aliens fit into nature, it stirs memories of her own childhood when the answer was clear.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.