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.
Each person would stay themselves to the extent they could, but they would allow become McMillan-ized. But they would take on the role that most suited them.
The Gibson family(James, Linda, Jon, Zoe, and Mikey), the Ferguson family (father Roger, mother Laura, daughter Nadine), the Meadows family (father Gary, mother Loraine, sons Biff and Wesley), the Black family (father Benjamin, mother Bethany, daughter Karyn), and lastly the Meshida family (father Katashi, mother Kamiko, daughter Yukio) would be reconfigured to best fit into those roles.
James, Gary, Roger and Benjamin, while not rich, were both charismatic enough, and were no slouches in the looks department. Katashi was the only adult male who was not. He was a traditional man who insisted his wife and daughter obey him. He'd even been so sure his child was going to be a boy that he'd chosen the name Yukio, traditionally male, before the gender was even known. Laura, Zoe and Nadine were both already pretty bitchy on most days, so they would remain so.
The farther a person was from even partial McMillanization, the more likely they'd find additional changes to their life.
