* If the minor is a beneficiary: If the will leaves something to the minor, the parent (or legal guardian) can contest the will on behalf of the minor if they believe the will is invalid due to reasons like lack of testamentary capacity (the testator wasn't of sound mind when making the will), undue influence (someone coerced the testator into making the will), fraud, or forgery.
* If the minor is not a beneficiary (or is disinherited): A parent might have less standing to contest a will directly on the minor's behalf if the will doesn't mention the minor or leaves them nothing. However, they might still be able to contest it if they can show that the will is invalid due to one of the reasons listed above (lack of capacity, undue influence, etc.). The argument might be based on the parent's moral or legal obligation to provide for the child, but this would be a much harder case to win.
* Legal representation: A parent acting on behalf of a minor will typically need to be appointed as the child's legal guardian *ad litem* (guardian for the purpose of the litigation) by the court. This ensures the child's interests are properly represented.
* Jurisdictional variations: Laws regarding will contests vary significantly by jurisdiction (state or country). Some jurisdictions might have more stringent requirements for challenging a will than others.
In short, while a parent can attempt to contest a will on a minor's behalf, success depends heavily on demonstrating a valid legal basis for challenging the will's validity, such as those listed above. It's crucial to consult with an estate attorney in their jurisdiction to understand their rights and options.