Of course, this being the wishing stone, and the fact that Jon's wish was so vague, the outcome wasn't going to be so straight forward.
The Fergusons, Blacks, and Meshidas would all be straight forward, because their families were already three people...meaning that the father would remain the father, the mother would remain the mother, and the daughter would remain the daughter.
However, The Gibson had three children, and the Meadows had 2. For the Gibsons, the father (James) and the mother (Linda) would stay as father and mother, respectively. The same would be the case for Gary and Loraine.
That left Jon, Mikey, Zoe, Biff and Wesley, enough for the Meadows and Gibson families to each have a teenage daughter, and still leave three...to form a new family.
But how would the new family be configured?