Uh, from infant age up until about 12 they kind of starred in that hit tv show.. oh yeah, umm.. geez, what's it called again? god..hmm.. FULL HOUSE! OH! And yeah.. then they went on to be the youngest self-made billionaires ever when they started their own production company and had, basically, their own line of absolutely everything.i don't understand why they're so famous?? they haven't starred in any hit movies or anything.