I think the game sounds unique and interesting, something for when the whole family is gathered together at some event and the LO has robust cognition. Be aware that if the LO starts to have memory impairment, this game isn't going to help their brain, just remind them that they are declining -- especially if they can't remember events in front of a family audience. "Reminding" people with dementia/memory loss is a no-no. Maybe a fun one-time activity.