- Is one of two children. Has a younger sister, Laura. Parents are Mary Jane and James.
- Has two children. Son, Daniel James was born 15 April 2006 and daughter Isabella Marie on 8 May 2010.
- Graduated from Los Alamitos High School in Los Alamitos, California in 1988. He also attended Orange County School of the Arts. He did not attend college.
- Left the entertainment industry in 2002 and now works in real estate.
- Resides in Aliso Viejo, California.
- Landed the role of Pie Eater in the cult classic Newsies (1992) after attending an open cattle call audition for the film. Legendary dancer and actor Gene Kelly visited the film set as a mentor to director Kenny Ortega and reportedly was impressed with Sidoni's acrobatics.
- Played soccer in his youth.
- Started dancing at 17 with no prior dance background or training.
- Waxed his chest for his role as Pie Eater in Newsies (1992) so as to resemble a young orphan.
- Appeared in Michael Jackson's 1991 music video "Black or White" alongside Newsies (1992) costar Kevin Alexander Stea. He would also go on to work with costars Mark David, Ivan Dudynsky, and the late Dominic Lucero (whom he was best friends with) in the early to mid-90s Nickelodeon sketch comedy series Roundhouse (1992).
- Is of Italian descent.
- Has lived in Florida and New York.
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