I am not a great pianist. I'm a Prefers To Not Play Any Black Keys kind of pianist. You don't have to be a virtuoso (or even good) to teach your child piano, you just have to be a good teacher.Teaching your own child piano is a blast! I started this blog as I taught my first child, and this chronicles the ideas and successes we've had. She's played the violin for 6 years and the piano for 5 (I think??) and my son is pushing his 4th year on piano. A good place to start is
Here's the entire list of current posts on teaching your own kid piano:
http://atreblemaker.blogspot.com/search/label/how%20to%20teach%20your%20own%20kid%20piano
Good luck! Feel free to contact me with any questions! emailatreblemaker@gmail.com