To expand on that a little, as it can be a little confusing. 😄
Consider:
- Blue Theme
'-- Child of Blue Theme
If you changed template "row" in Child of Blue Theme to:
<h1>Child!</h1>
When viewing the page this template is used, you will see "Child".
Now consider you change the same template "row" but in the Blue Theme to:
<h1>Parent!</h1>
Although Blue Theme now has changes, the Child of Blue Theme's changes will overrule the parent, so you will still see: "Child".