So that his dad didn't see or hear him, he went upstairs into his room.
"Control the size of my dad's socks," Jim whispered.
He then took a deep breath, blew into the balloon and it expanded with a “FFOOOOOFFF” and the sound of stretching rubber.
At the same time, Ron's socks seemed to expand, getting bigger, much bigger than his foot size (10).
They grew to size 15, and began to sag a bit.
Jim blew into the balloon again. It expanded with a FFOOOOOOOOOFFF.
Ron's socks grew more and more, and soon, they were As big as a sleeping bag.
Ron stirred in his sleep, and shook the enormous socks off his feet. Ron's feet were now bare.
Not that Ron noticed - he was asleep.
Jim snuck down, And he saw his dad's socks, lying on the floor of the living room, were now as big as sleeping bags.
"amazing, it really does work." Jim said to himself.
He released the air outta the balloon, and then, he checked his dad's socks were still enormous. They were.