Good evening ma'am, you can't revoke your child's citizenship, only he or she can do that when they are 18.
To be eligible to renounce your Canadian citizenship, you must:
be a Canadian citizen
prove that you are or that you will become a citizen of a country other than Canada if your application to renounce is approved
not live in Canadabe at least 18 years old
not be a threat to Canada’s security or part of a pattern of criminal activity and
understand the significance of renouncing your Canadian citizenship.http://www.cic.gc.ca/english/citizenship/renounce-eligibility.asp