So, what ep is brave heart? the 5th ep?

Depends on if آپ count Broken as one یا 2 eps. I believe TPTB officially counts it as 2. So Braveheart will be 6th.

According to لومڑی and the House producers, Broken counts as 2 episodes, so it goes like this:

1 & 2: Broken
3: Epic Fail
4: The Tyrant
5: Instant Karma
6: Brave Heart

Brave دل will be the 6th episode.