You may have already watched the movie Searching for Bobby Fischer. If not this is an excellent movie no matter your kids playing chess or not. If your kids do inspired by Searching for Bobby Fischer and their interest on chess is aroused by the movie, Chess Stars Here serves a nice complement. The real Josh Waitzkin and Bruce Pandolfini in the movie teach the fundamental of chess in this video in a well organized approach.
If your kdis are really interested in chess and perform well in school chess club or program or local scholastic tournament and want to improve beyond beginner level, Chess Success Secrets may be used to boost their chess strength shorten the learning curve.
If your kids are scholastic tournament players and have an USCF rating above 1200, Grandmaster Strategy Video Training Library will be good for them. It includes 14 e-books (over 2000 pages) and 29 videos of chess instruction.