Recap of Teen Mom 2 Season 4 Finale (April 29, 2013)

Credit: MTV

Please grab a giant tub of tissues and prepare to cry your eyes out, because things are about to get all kinds of emo. Like, even more emo than Conor Oberst's bangs. After years of uncertainty, it looks like Leah Messer and Corey Simms are finally getting some answers about Baby Ali's mysterious medical condition!

This is great news, but poor Ali has to undergo surgery so the docs can do a muscle biopsy and figure out what kind of disorder she has, which causes both Leah and Corey to break down in the hospital waiting room.

Considering that these two have a fraught relationship full of baseball hats and phone-burping, we're more than a little impressed by their solidarity. Leah and Corey totally have each other's backs, and Leah's hubby, Jeremy, is able to get time off work to come with them to the hospital. Aww, they're just like one big, happy family!

But back to what's important: what muscular disorder does Baby Ali have? That remains to be seen, but it's looking more and more like she has Mitochondrial Disease, which causes cell injury in the brain, heart, liver, skeletal muscles, kidney, and both endocrine and respiratory systems. The disease can cause loss of motor skills, muscle weakness, seizures, liver disease and diabetes (among other ailments), and if Ali is officially diagnosed it will be a lot to take in.

The good news? This adorable kiddo is amazingly brave, and we're sure she can make it through anything!