I don't play piano, but my seven year old daughter does. She's doing her grade 2 exam soon enough. I would also second that advice too! My wife taught her some

I don't play piano, but my seven year old daughter does. She's doing her grade 2 exam soon enough. I would also second that advice too! My wife taught her some basics but we got a private teacher for her about a year ago, that has supercharged her ability. She does a 40 minute lesson once a week. The teacher writes notes on what she is to practice and learn. She practices her work for about an hour a day, and spends maybe another 30 minutes figuring out songs she likes (the Harry Potter theme is her current interest). I would recommend doing the same to anyone else, a private teacher is the way to go. As a side note, she didn't just start from zero, we've had her in some form of music and rhythm class since she was 9 months old. She has a good ear for music, timing and instruction, to the point where she used to surprise other parents/teachers with how attentive she was. Also I make sure to have the classical radio on every morning and evening to further train her ear ;)