A lot of times when you see a kid in a movie or in a tv show, actually you are seeing two kids playing the same character. This is the case of the Olsen twins, who played Michelle on the show Full House (Padres forzosos).
This happens a lot of times, because there is a strict law about the children work.
I want to share this video with you, where there are more cases like the Olsen Twins.
The song is "Identical Twins" by Olsen Twins.
I hope you like it!