I enjoyed the documentary about Jackie Onassis and Lee Radziwill, her sister. They had a typical but interesting relationship.
I also liked the documentary called Tell Me Who I Am. It shows that one of a pair of identical twins (Alex) loses all of his memories after he is involved in a motorcycle accident at the age of 18. It then shows the consequences of a decision made by Marcus, the other twin, to suddenly holds all of his Alex's memories, and instead impart a picture of a happy childhood on him even if that might not have been the case. I was fascinated by the toll that this decision took upon both now middle age men. It seems like a psychological thriller but is actually true.