Fixing upstream sent too big header while reading response header from upstream in Bitnami WordPress
One of the way to load CSS in your WordPress plugin. You no need to worry about caching while developing your code and no need to separate one more file.
It is not difficult to get the name using the build in function from WordPress. You may use this for build your own plugin or list out the related post using the category data from the parent category. Here is the PHP Code that can display out the name of the parent category.