(Firstly, please make sure to have a stylus to take advantage of the design of this app--using one's finger does not allow someone to learn how to draw the shapes at the correct degree/slant.)
I'm actually a mother in my 30's using this app to revisit the instruction I sorely took for granted when I was a child. Years of computing have degraded the quality of my penmanship and this app is successfully reviving what was taught in grade schools in the 80s. :)
Except this time, it just feels less tedious--perhaps because this time the user gets to choose what parts she is interested in learning. I have a small child, as well, and I think I would like to share this with her, once she masters printing.