After managing for about a day or two, still trying to keep the children (who already know what's going on) from finding out, Dan (in Sara's body) goes to the doctor because he (she) is feeling sick and discovers that he (she) is pregnant.
The rest of the movie continues in similar fashion: as they live life in the other's body they grow to understand one another.
Her nurturing nature leads to her/him implementing the sort of "reward" list and tactics usually expected in a classroom.
As time passes, both parents really begin to understand what the other was complaining about, commenting on this to one another and wondering if they'll ever switch back or if they'll be stuck in each other's bodies for the rest of their lives.
They call the babysitter, who translates that the spell will reverse once its purpose is complete: when their parents truly understand each other, they will be restored to their rightful bodies.
After the babysitter leaves and the Andersons go to bed, Dan and Sara apologize to each other, then kiss, which turns out to be the necessary act of understanding.
Adding to these coincidences, principal photography of the film began on June 29, 1998, what would have been the 17th wedding anniversary of Hampton's marriage to Waymer.
Whilst noting plot similarities to Freaky Friday, Trading Places and The Parent Trap, as well as character stereotypes, Ray Richmond stated "there is so much to like about the genuinely canny show that all of the other stuff sounds nitpicky and harsh.