Best way to handle parent and child pages?

I want to list episodes of a series I am making of instructional videos with content.

The patent page “series” will list episodes weekly. Ie: episodes 1, 2, etc.

I’m thinking to setup a template to loop through the series parent page to display the episodes children content in a loop.

Then on each series page there will be 3 panels. A long one with the video and other episodes thumbnails, one on the left and one on the iught with content.

Just trying to work out how to display the children > children post content as above.

Problem 1: displaying related thumbnails to other children?

Problem 2: displaying the 3 panels. Do I set these up as individual children elements? If so, how can I style each one differently as it loops through?

Any code examples would be amazing! Unless there’s a plugin for this?

Thanks!