children learn to manage their own money at a young age whic

当然有错误.
可以说：
Children who learn to manage their own money at a young age will be less reliant on their parents and become more independent,which can give the children valuable practice and cultivate their good habits,and make parents more responsible in turn.

修改后：children learn to manage their own money at a young age， which make the children more independent, and less rely on their parents. Not only children's good habit to be cultivate, but also a responsible parent could be shaped.
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learning to manage their own money at a young age, which can make children more independent, besides,they won't depend on their parents too much