Mont. Code Ann. § 40-6-233

The abuse of parental authority is the subject of judicial cognizance in a civil action brought by the child or by its relative within the third degree or by the county commissioners of the county where the child resides. When the abuse is established, the child may be freed from the dominion of the parent and the duty of support and education enforced. A parent or guardian of a child has the right to give the child medicine prescribed for the child, and exercise of the right is not an abuse of parental authority.