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Come on...be serious...8 years old boy....????????? are you joking here...?
 
No and even if he was 18, he still couldn't sponsor except in very few cases such as he's living in one of the provinces that has a family stream PNP, he's lived there for 1-2 years, he has good income and money in his bank account etc. The uncle would have to meet some requirements too.
 
Actually...the question should be....Can an English Uncle spank his 8 Year Old, Bratty, Canadian Nephew?
 
I am wondering if the OP did not fully describe his case well..for example, if he were suddenly the guardian of this 8 year old, and didnt' understand the immigration process, and wanted to live in Canada, with his 8 yo nephew, to not disrput the child's daily life, I could understand the question better. But with respect to the general undertaking to sponor any someone, the sponor must be an adult.

If the case is similar to what I suggested, perhaps under Humanitarian considerations...the guardian[uncle] would be allowed to stay in Canada for his family member....but again, more information would be needed to understand what the OP was trying to ask.