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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I have one girl and one boy myself.
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& P2 c% w) k9 h) aAny one might know how to do this or help? How to do the paper work in China?
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+ o$ y! Y' q. N+ V7 J4 L# ?' JThanks first.