Display child page when on parent?

Hi!

I was wondering if someone could help me..
I’m creating a custom wp theme for a school. I got a page named “Courses”, that displays a list of courses.
Each course has sub-pages (introduction, programme, time table etc.), and I want to directly show the introduction when clicking one of the courses..

So the page hierarchy looks like this:
Courses

• Course 1

• Introduction
• Programme
• Time table

• Course 2

• Introduction
• Programme
• Time table

and so on.

I’ve seen some solution for this using a redirecting with a page template, but I was wondering if there is some other solution for this?

Thanks in advance ??