Three Identical Strangers is a 2018 documentary film directed by Tim Wardle and starring Edward Galland, David Kellman, and Robert Shafran. It examines a set of American identical triplets, born in 1961 and adopted as six-month-old infants by separate families, unaware that each child had brothers. The separations were done as part of an undisclosed scientific "nature versus nurture" twin study, to track the development of genetically identical siblings raised in differing circumstances. Combining archival footage, re-enacted scenes, and present-day interviews, the documentary reveals how the brothers discovered one another at age 19 and thereafter sought to understand the circumstances of their separation.
Ohhh! Sounds very interesting. I'm curious to see what it reveals. Have added it to my list.