“Full House” creator reveals ‘miraculous’ on-set moment with Mary-Kate and Ashley Olsen: ‘It was jaw-dropping’ (exclusive)

Jeff Franklin tells PEOPLE he was amazed by the Olsen twins’ acting during the season one finale of the show ...

“Full House” creator recalls ‘miraculous’ on-set moment with 1-year-old twins Mary-Kate and Ashley Olsen: ‘How is this possible?’

Jeff Franklin detailed the impressive acting that the child stars were doing during the first season of the sitcom.