Are you saying you've got a single documen type or am I misreading thsi?

It would be much nicer to go up to up to the parent "SectionDocType" - e.g. CurrentPage.AncestorOrSelf("SectionTypeAlias") but this should work via level:

If you have to include this on all pages then you'll need to check what level you're on I guess (included - I've guessed level two).

@{
    if(CurrentPage.Level > 2) {
    var section = CurrentPage.AncestorOrSelf(2);
    if (section != null)
    {
        var childItems = section.Children;
        foreach (var page in childItems)
        {
            <p>@page.Name</p>
        }
    }
    }
}