I am currently building my fourth site using the fantastic WP-andreas01 theme as my base (thanks Andreas!).
On this new site, I want to be able to have the subpages nested underneath their parent page on the page menu in the left hand side bar. Also, I only want the subpages to display if the site user is looking at either the parent page, or one of the ‘sibling’ pages.
For example, if I have a menu that looks like this:
…and then I click on “Page 1”, it should display the subpages: