def remove(
        self, name: str, child: Union["NewBaseModel", Type["NewBaseModel"]]
    ) -> None:
        """
        Removes given child from relation with given name.
        Since you can have many relations between two models you need to pass a name
        of relation from which you want to remove the child.

        :param name: name of the relation
        :type name: str
        :param child: child to remove from relation
        :type child: Union[Model, Type[Model]]
        """
        relation = self._get(name)
        if relation:
            relation.remove(child)

        Removes given child from relation with given name.
        Since you can have many relations between two models you need to pass a name
        of relation from which you want to remove the child.

        :param name: name of the relation
        :type name: str
        :param child: child to remove from relation
        :type child: Union[Model, Type[Model]]
        
ormar/relations/relation_manager.py