Jeff had thought to himself "Mom'll probably enjoy being able to baby Megan again. It'll also get her out of my hair for awhile."
Megan herself thought "Well Mom's been doing a lot lately. Whatever Jeff does Mom wont have to worry herself, I'll take take of her even if Jeff or Dad wont."
While their mother thought "Jeff and Megan were so cute when they were babies. Well I can't make Megan a baby again, but it'll be nice to take care of Jeff like that again... I don't think they'll mind if I used the chronivac to make myself lactate again."
Then when Jeff hit enter all three of them shrank down fast leaving two babies with pink shirts sitting and then leaning back on Jeff's bed and a baby with a blue shirt in Jeff's desk chair. The three of them realizing what happened started crying upset, they were all babies after all none of which were able to get to the chronivac and change themselves back.
Later that day the dad of the house came back, and the babies had cried themselves to sleep. He stumbled on them and was VERY confused and at first very angry at Jeff for probably having gotten some woman pregnant with maybe triplets? They didn't seem the same age... maybe three different girls or one girl three different times? What was that on the computer? Chronivac? He saw the profiles of his family with their ages set below 2... The babies were currently asleep, but... now he had all the power. He could have some fun with this, all he had to do was.