Unknown to most people there are a set of laws to time like that of Gravity, the conservation of Mass, or the expending of energy. Time could not be unwound or undone but it could be transferred from one item to another. And so as Jeff created a hole where his father once was by turning John into his smoking hot Latina girlfriend, Anita , the universe needed something to take up the time that was being stripped from John in exchange and fill the void in the family Jeff and John were creating by this action.
With the Kendrick family missing a father and there's no mother since her passing, the program decided to find the closest target that will be a suitable replacement from the former John. The change will happen the same time as the father changing into Jeff's girlfriend and will last one hour with mind, clothes, and reality just like the former John. But what to pick?
There is Amy, a five year old sister of Jeff who was in her room doing homework.
Then there is his older brother, Chris. Who is a jock football player that Jeff dispised who is returning home after a long after noon of football practice.
Then there is a friend of Jeff's as he, or she, walking to his house to hang out with him.
Or it will be the family dog, Ruff, who was sleeping in the father's bedroom.
And there could be a random stranger close by that is unaware of the Chronivac's ability to replace the former father, now Jeff's girlfriend.