these girls, cousin sophia grace and rosie grace first gained attention for a video of them singing nickiinaj's "super bass." suddenly, they were on ellen ge jenless, even min minaj herself. and david, now 10, has seen a lot of the world. you got to do cool things because of the video. >> yeah, i have -- i've gotten to go to, like, los angeles and brazil. >> reporter: are these trademarked? >> working on that. >> reporter: he may be one of the few for bhom this is a near full-time vocation, but certainly not the only parent to rake in the cash from his son's fame. >> there are those parents who are about making money any way they can, even if it means exploiting their children on the net, though in their minds, they're not doing anything wrong. >> reporter: but some parents produce videos with the express intent of turning their child into a star. take rebecca black, whose mom spent $4,000 to produce and write the song "friday." ♪ friday friday >> reporter: it went viral. and made her famous. but not always in a good way. many called the song the worst of all time and received several dea