Grasshopper and Sensei started learning Chinese when she was in kindergarten. My neighbor tutored Chinese so it was easy to slip this in. I thought we were all set but then she moved away by the end of that school year.
To continue their Mandarin, I put my girls into Chinese school for adopted Chinese babies. No one speaks Chinese at home. I was in Chinese school for one year when I was in elementary school and my siblings and I were the ONLY kids who spoke English at home. It was not a great experience.
After two years of this Chinese school, my girls wanted out. I hired another Chinese tutor who evaluated them to see what they knew. It turns out that my kids only knew how to count to 10 in Chinese. How could this be? I had sat through those Chinese classes while the teacher drilled flashcards covering the colors including silver and gold! They had been taking Chinese for more than three years!