It's a little too quiet to hear some parts. Here's the translation of the adorableness:

 Aria (kiss on the head and then hugs): I love you.
 Asher: I love you. Aria: Too. (Wanting him to say I love you TOO.)
 Aria: You're the best brother that I've ever had.
 Asher: You're the best brother that I'VE ever had.
 Me: Butting in and correcting him.
 Asher: You're the greatest sister I've ever had.
 Aria: Goodnight.
 Asher: Goodnight.

 CAN'T TAKE THAT LEVEL OF INTENSE CUTENESS.
 (I may have teared up just now uploading it. Most perfect children ever.)