public function getPrimaryParentsNames($classname = '', $display = ''): string
    {
        $fam = $this->primaryChildFamily();
        if (!$fam) {
            return '';
        }
        $txt = '<div';
        if ($classname) {
            $txt .= ' class="' . $classname . '"';
        }
        if ($display) {
            $txt .= ' style="display:' . $display . '"';
        }
        $txt .= '>';
        $husb = $fam->husband();
        if ($husb) {
            // Temporarily reset the 'prefered' display name, as we always
            // want the default name, not the one selected for display on the indilist.
            $primary = $husb->getPrimaryName();
            $husb->setPrimaryName(null);
            /* I18N: %s is the name of an individual’s father */
            $txt .= I18N::translate('Father: %s', $husb->fullName()) . '<br>';
            $husb->setPrimaryName($primary);
        }
        $wife = $fam->wife();
        if ($wife) {
            // Temporarily reset the 'prefered' display name, as we always
            // want the default name, not the one selected for display on the indilist.
            $primary = $wife->getPrimaryName();
            $wife->setPrimaryName(null);
            /* I18N: %s is the name of an individual’s mother */
            $txt .= I18N::translate('Mother: %s', $wife->fullName());
            $wife->setPrimaryName($primary);
        }
        $txt .= '</div>';

        return $txt;
    }