Listing Subcategories with posts in category page

I was wondering how can I make a listing of Subcategories with showing content of the posts in the parent category page.

So that when you visit /category/parent-category you see something like:
* Subcategory 1
o Post 1 content (not just a link)
o Post 2 content (not just a link)
* Subcategory 2
o Post 1 content (not just a link)
o Post 2 content (not just a link)