Have your kids practice writing letters and turn them into a font to use on your computer. Your Fonts is a free webservice that turns your hand-written fonts into a font file that you can use in any way you would use any other font.
All you have to do is print out the form, have your child (or you, because I know you’re gonna want to do this too.) fill in each letter, scan it, and send it back to Your Fonts. They convert it and give you a link to download the file. They also provide you with instructions for how to install your newly created font.