As the family continued on their hike, Nigel's bare [and mud-coated] feet began to grow.
They grew and grew and grew at least 3 shoe sizes bigger than his normal shoe size [8], thus making the footprints get bigger.
when the family stopped at the lake, they saw their reflections in the water, and then they saw how their tfs had processed:
Billy's hands had transformed from five digits fingers to three digits fingers. and the 2 lumps on his hips had turned into small stumpy arms.
WIlma's Arms were longer, and her hands were 3 fingered, with claws.
And Nigel's bare mud-coated feet were 3 shoe sizes bigger, with sharp claws in place of toenails.
and all of them had half brown half neon blue hair, and pointed ears.
"Looks like our tfs are progressin, Dad." Billy said. "We're looking less human and more monster by the minute."
Indeed.
Nigel immediately wriggled his massive monster-size mud-stained clawed toes.
"I've got some cold, squelchy toes, and some big ol' monster feet." Nigel said.
He had to try taking a few steps. It was a strange sensation, walking with such big feet. It reminded him of a past family vacation when he had gone diving with his family and he had been walking around with flippers on his feet.
And the tf was still goin on!