"Well," Manny said, "I fancy morphing into... a monkey!"
"A monkey?" Margaret and ANdrew said at once.
"Yup." Manny said. "I think being a monkey makes me a much better climber, so I won't need the ladder when we need it for things, like gettin our Christmas tree from the attic, changing lightbulbs, etc."
"Sounds a good idea, DAD!" Andrew said. "GO for it!"
Immediately, Manny shrunk till he was exactly ther same height as his son.
"Wow!" Andrew said, as he saw his shrunk-looking dad, now taking off his largened clothes. "We're exactly the same height, now, dad!!"
"Oh, it's just getting started." Manny said, removing his underwear, and standing, naked as the day he was born.
Immediately, his ears became big and round, almost monkey like.
Suddenly, a tail with fur in the colour of his hair stuck out from his butt. "Holy cow! You've grown a tail!" ANDREW SAID TO HIS DAD.
"Indeed." Manny said, shaking his new tail.
THen, his mind changed, becoming more and more of a monkey, and thick fur in the colour of his hair grew all over his body, save for his face, which remained human.
Manny was now a monkey.