This improv game is in the following improv game categories:
As a suggestion ask for a family activity, then start a normal scene.
As soon as all characters and their relationships have been established, freeze the scene, pick a player, and ask for an emotion for that player. The scene then continues, and the player is overcome with that emotion.
Repeat till all players got an emotion. The scene has to keep evolving after each emotion assignment, and of course players shall try Justifying the emotions.