Forever young TV stars are all grown up

You know the ad: Little blonde girl teams up with her brother and very serious older sister to leave out a bowl of Corn Flakes for Santa. The siblings all fall asleep and only the young girl wakes up to meet the man himself and say “ho, ho, ho”.
The girl in the baby-pink onesie was actually played by twins Alexandra and Holly Stapley in the late 1980s.