How do you tickle your dad's feet?

it's easier to tickle your dads feet when he's sleeping. If its in the morning and you have to wake him up its a perfect way to do it. and when he does wake up it doesn't mean you need to stop tickling. you could even tickle him for fun. when he's sleeping lightly tickle his feet and when he chuckled a little and wakes up you can keep at it to get a good laugh out of him