public function removeGroup($parentName, $childName)
    {
        $parentDn = $this->dn($parentName);

        $childDn = $this->dn($childName);

        if (is_string($parentDn) && is_string($childDn)) {
            $del = [];
            $del['member'] = $childDn;

            return $this->connection->modDelete($parentDn, $del);
        }

        return false;
    }