Great-Gran Gran shows JoJo an old family photo – it's fun spotting Gran Gran, Mummy and Great-Gran Gran when they were younger. JoJo recognises some people, but there are lots of members of her family that she’s never met before. Gran Gran has an idea for a Gran Gran plan – they can use the family photos to make their very own family tree. But who is on the missing photo, and why are they so important to JoJo?