Leah Messer and Corey Simms have come so far when it comes to raising their twins!

In a sneak peek clip for the Teen Mom 2 reunion special, Dr. Drew, Leah, and Corey discussed how their parenting has changed over the years when it comes to raising the twins, Ali and Aleeah. As fans may know, Ali has muscular dystrophy and it started taking a toll on Aleeah's behavior which was shown this past season.

Corey explained why his outlook on Ali using her wheelchair has changed and said, "I'm starting to see how she really needs it a lot more and that it doesn't conserve her energy."

Dr. Drew complimented the father-of-three and said he is more "proactive" when it comes to his twins and brought up how he suggested Aleeah seeing a therapist. Leah broke down in tears discussing the change she has seen in Aleeah and gushed how she feels "really special!"

Watch the Teen Mom 2 reunion special tonight at 9pm ET, only on MTV!