**I read your edit:
My son, also takes Piano. Why? Because, HE likes it. He is as I said, 6 years old. He started when he was 5 years old. He's only been taking it for a few months thus far.
Practicing, is per his Teacher... who says that at this age, ONLY 10 minutes a day. And my son does it without being nagged about it. He practices on his own by himself. I do not have to do it with him. Although I can play piano and can read music. My SON is the one, who wants to continue with piano.
My daughter, also.
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BY next Summer... he will have different interests, or will want to do something else. It is a LONG time, 1 year... to hold a child to what they "at the moment" want to do, next... year.
I have 2 kids who are 6 and 9.
Let me tell you, they tell me NOW, what they want to do NEXT summer all the time. But by the time next summer comes.... they have a DIFFERENT idea.
Ultimately, a child should "do" what THEY are interested in or what they have a proclivity for, or what they seem to have a "talent" in.
My parents thought I should learn Piano when I was a kid. Just like you do. BUT... I HATED PIANO! Just hated it. I had to take it for 2 years. It was TORTURE and my parents wasted all that tuition money. I just did not want to take, Piano. I was interested in other arts and instruments. I played the Oboe. I excelled at Art & Sculpture classes etc. I also, was NOT my siblings. There is no reason, that all the kids in the family, has to do the SAME thing, nor only what the parents envision.
And at 6 years old... many interests will arise.
My son who is 6 likes: Skateboarding, Tennis, Hiking, playing video games, playing Super Hero, digging in dirt, riding his bike, and fixing things with Daddy. That is just a short-list, of his interests.
OH! And this past summer (he was still 5 years old then and just turned 6 recently)... he ENJOYED going to summer school. He LOVED it. Can you imagine? A 5 year old that LOVED summer school???
And he went to summer school... not because it was *my* choice... but HE told me and my Husband, that THAT is what he wanted to do, this past summer. And he loved EVERYDAY of it.