When is a child old enough to not require a guardian appointed in my will? August 31, 2021 17:33 A child under the age of majority in your province of residence requires a guardian. Related articles Can my chosen representative appointed in my POA care for my dependants? Can My Healthcare Representative (Power of Attorney) Override My Wishes?? How do I choose a Guardian for my children? I want to exclude a spouse, child or other family member from my will. Do my spouse and I need to appoint the same guardian for our children?