Simon's dad was just downstairs in the basement. Simon put in the coordinates, and specifically delegated the information about his father, then put in the subtext for the newly assigned configuration.
12/119lbs/4'1"
And then he pressed Enter.
Time passed, and he walked into the living room. His father could be heard coming up the stairs in a panic. A younger boy that slightly resembled Simon's father came bursting in, and screamed.
"Dad??" said Simon.
"Who are you? What's happened to me? Oh my God, I've turned into a child! This has to be a dream!" the boy squeaked. He was in his underwear, apparently the large pants he was wearing would no longer fit. The boy wore a man's dress shirt and sportsjacket, which awkardly slipped around on him, as the shirt almost came down to the boy's feet.
"Dad, it's me. I don't know how, but I'm an adult now, and you...you're a kid. What are we going to do??" Simon said, feigning panic. He knew very well that now he could take charge. There was no one that lived in the house but them. He could do whatever he felt like from now on, and his dad was just have to pipe down and get used to it.