def METHOD_NAME(
    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.METHOD_NAME(child)