Are there any great Team Based MMORPG games for kids?

I wish a purify game please. It has to be Team Based for my kids. They similar to fighting and action. Somthing Like Bots but right away they have been grown sleepy of it.
Thank you in Advance
Well Wolf Quest has not most fighting and the not reallyl TEAM BASED. I do not think my kids would wish to play as WOLVES.
OOps forgot to add Free. it can be similar to compensate for one more features.

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