Dependent child," in respect of a parent, means a child who is in one of the following situations of dependency, namely: Select one: is less than 19 years of age and is not a spouse or common-law partner, or is 19 years of age or older and has depended substantially on the financial support of the parent since before the age of 19 and is unable to be financially self-supporting due to a physical or mental condition is less than 22 years of age and is not a spouse or common-law partner, or is 22 years of age or older and has depended substantially on the financial support of the parent since before the age of 22 and is unable to be financially self-supporting due to a physical or mental condition is less than 19 years of age and is not a spouse or common-law partner, or is 19 years of age or older and has depended substantially on the financial support of the parent since before the age of 19 is less than 19 years of age and is a spouse or common-law partner, or is 19 years of age or older and has depended substantially on the financial support of the parent since before the age of 19 and is unable to be financially self-supporting due to a physical or mental condition