Very young children are usually played by twins on TV and movies. This is because it's hard to get such small children to act the way you want them to, and because there are laws restricting how many hours they can work. read more
If you have to film an episode of a TV show every week, it makes sense to have twins portraying an important child character, so that one twin can work while the other rests, and if one twin can't or won't act according to what the script requires, you can try to get the other twin to do so. read more
Most of the books were not an episode in the series. Michelle is about nine years old and Stephanie is in her teens in the series. The books were mainly published in the 1990s. Fuller House. The twins declined to reprise their role for Fuller House, the 2016 Netflix sequel to Full House. read more