The space family is a certain type of family that you can get from a famitama, or the Dating Show on the v5.
It evolves from an Iwatchi, to a Hoshitchi, to a Mikazukitchi, to a Sunnytchi.
At the dating show, instead of a matchmaker there, it is replaced by a Planetchi.
It only gives you one type of tamagotchi, a Sunnytchi.
It will marry your tamagotchi & you will only have one egg that would be a boy or a girl.
Hope this helped :furawatchi: