House, also referred to as "playing house" or "play grown up", is a traditional game, a form of make believe where children or adults take on the roles of a nuclear family, which typically consists of a father, mother, a child/children, a baby, and a cat/dog.
Iranian "Mamy" game with a little girl playing the mother and a little doll in the role of her daughter
This game is most commonly played with children ages 3–5, and often with props (most schools have a "kitchen area" with plastic food). The nature of the game usually attracts girls, but boys will sometimes play as well, usually with some reluctance. In one episode of Pee-wee's Playhouse, Pee-wee, Miss Yvonne, and several playhouse denizens play this game.
Every person assumes a role, and then they invent household scenarios in which everyone takes a part: getting food, doing chores, fixing things, going places, "making babies" (with varying degrees of realism), caring for the younger children, feeding the pets, welcoming the husband home from work, etc.