It seems that when I create a Child Story from an Epic, the Children are properly added and they show up in the "Roadmap" tab, however if I created a Story, then click "Link Issue", add "child of" relationship to the Epic, the Children does not show up in the Roadmap.
When I click into the Epic, I found that the added child Story is under "Linked issues" instead of "Child issues".
So just wanted to see if anybody knows how to properly link a Child issue to a Parent issue?