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I am seeking someone help to Fill up form for my dependent child under Family class sponsorship.

This forum is paid for by an immigration lawyer. You can find their contact information in the top left hand corner of the screen.
 
Honestly your best option for free help would be a family member or a trusted friend who is proficient in English. The forms and instructions are straightforward and easy to follow if your english is ok.
Regardless of who's willing to do it, you shouldn't share your (and your child's) personal information with a complete stranger you meet online.