Ha! If only they knew you were hanging on by a thread!
The truth is that often the STUDENT is a math geek, and the parent would rather be ANYWHERE else but studying math, even hanging off a cliff! For that reason, I've located some free resources for calculus. These are free or free for a short trial period. Some may fit your family and others not, but check them out. Hey, at least the price is right - and it may be just the encouragement that your little Einstein needs right now!
http://www.khanacademy.org/#Calculus
http://www.brightstorm.com/math
http://www.themathpage.com/index.html
http://tutorial.math.lamar.edu/
http://www.explorelearning.com/index.cfm?method=cResource.dspChildrenForCourse&CourseID=131
http://www.quickmath.com/
http://www.sosmath.com/calculus/calculus.html
http://www.sosmath.com/cyberexam/cyber.html
http://cow.math.temple.edu/
http://www.midnighttutor.com/
Library resources are always free. Ask your librarian about AP Calculus resources you can use, and the Teaching Company course called "Calculus Made Clear."
Finally, for a $30 hotmath.com membership you receive access to Thinkwell pre-calculus when you look under "videos"

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