收养16 years old boy，just 失去亲父, how to申请?

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收养16 years old boy，just 失去亲父, how to申请?收养16 years old boy，just 失去亲父, how to申请到加拿大? 母亲失去监护权，以后不可能申请到加拿大探亲的机会。
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4 V1 L; }3 q5 E3 U9 `. T4 X$ F& sI have one girl and one boy myself.
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6 Z8 K- B& Y4 l& ^' d; sAny one might know how to do this or help? How to do the paper work in China?
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Thanks first.