Parents need to know that this documentary is about the filmmaker Doug's parents. His mother dies suddenly and Doug and his two sisters -- adults over 40 -- talk frankly about how they're handling the loss and what they think of their father remarrying three months after her death. Doug reads his mother's diaries and learns about her near-constant unhappiness in the marriage and obsession with her therapist. The possibility of infidelity on both sides is discussed at length. Doug's mother admits to smoking pot while visiting one child at college. There's also a mention of the sexual revolution and what some suburban couples were doing at the time (exchanges, etc.).
Sex:Infidelity is discussed at length, as well as Doug's mother's obsession with her therapist -- many highlighted journal entries discuss longing and unfulfillment. A mention of partner swapping and "handsies" at a drive-in.