Use Parent Pages for URL Structure without Landing Page

It seems that you might be creating a parent page for the wrong reasons. There are other classes that will be added to identify the current menu item and you can also change that behavior using a menu walker.

The current menu item should have current-menu-item class added to it so you could leverage that in your CSS.

Also in the menu setup instead of addding a parent page create a Custom Link with URL set to # if what you’re after is just creating the right menu hierarchy.

As for the redirect, you can accomplish the functionality you describe by editing the page template php without the need for a child-parent relationship.