Birth of a Family is a First Nations Canadian documentary from 2017
It is an excellent movie and very moving seeing the family reunite. They were all taken away from their mother by the Canadian government in some misguided policy to Anglicize them. Apparently they were taken away each individually after they reached a certain age. The family discusses the possible reasons and find none
The oldest daughter is the one who finds them and reunites them
From Wikipedia
Birth of a Family is a 2017 First Nations Canadian documentary directed by Tasha Hubbard and co-written by Hubbard and Betty Ann Adam. It follows three sisters and a brother, adopted as infants into separate families across North America, who meet together for the first time.
Summary
The reunion emerged from decades of searching by Betty Ann Adam, the eldest of the family. Removed from their young Dene mother's care as part of Canada's infamous Sixties Scoop, Betty Ann, Esther, Rosalie and Ben were four of the 20,000 Indigenous children taken from their families between 1955 and 1985, to be either adopted into white families or to live in foster care. The documentary follows the siblings as they reunite in Banff, Alberta. As the four siblings piece together their shared history, their connection deepens, bringing laughter with it, and their family begins to take shape.
You can watch it for free online here
https://www.nfb.ca/distribution/film/birth_of_a_family
Director Tasha Hubbard
Tasha Hubbard is a writer, filmmaker, and an Associate Professor at the University of Alberta. She is from Peepeekisis First Nation in Treaty Four Territory and has ties to Thunderchild First Nation in Treaty Six Territory.
https://thestarphoenix.com/life/bridges/through-a-compassionate-lens-tasha-hubbard-highlights-systemic-injustices