I'm trying to create a menu in Drupal 8 that is just sibling links of the current page. So if the menu is:

• Home
• Parent 1
  • Sub-parent 1
    • Child 1
  • Sub-parent 2
    • Child 2
    • Child 3
    • Child 4
• Parent 2

When I'm on the "Child 3" page, I want a menu block to link to look like this:

• Child 2
• Child 3
• Child 4

I know how to do this in D7, I think, but I'm having a hard time translating that knowledge to D8. Is this even something that is doable in D8? And if it is, can someone point me in the right direction on how to do it?

Thanks!

I'm trying to create a menu in Drupal 8 that is just sibling links of the current page. So if the menu is:

• Home
• Parent 1
  • Sub-parent 1
    • Child 1
  • Sub-parent 2
    • Child 2
    • Child 3
    • Child 4
• Parent 2

When I'm on the "Child 3" page, I want a menu block to link to look like this:

• Child 2
• Child 3
• Child 4

I know how to do this in D7, I think, but I'm having a hard time translating that knowledge to D8. Is this even something that is doable in D8? And if it is, can someone point me in the right direction on how to do it?

Thanks!

Clarification: The child level needs to be variable, so that menu items with different depths can display their siblings. So for instance, in addition to wanting a menu for the children, I'd need a menu for the sub-parents and a menu for the parents and so forth. I also have no control over/knowledge of how deep the menu goes and if it goes that deep on all sections.