Family Photo

In your inventory from the start: Ethan carries it (a picture of Mia and Rose).

It has one use: put it in the letterbox at Beneviento's Grave (House Beneviento entry, chapter 6). It opens the Elevator Passage Lower, the lift up to House Beneviento.

Key items sit in their own tab (Key Items) and take no case slots, so there is no need to discard it.