Diana, Our Mother: Her Life and Legacy ★★★★★

I'm a little biased because I am obsessed with Princess Diana. That being said, this documentary is the first one to incorporate interviews from Prince William, Prince Harry, and many other of Diana's closest friends. 

In other words, this documentary is not generic. It casts an intimate portrait of Diana- as a person, and as a mother- not as a princess. I highly suggest it.