Flanders at the end of the episode where Maude dies……”I’m here every Sunday, rain or shine!”. Really beautiful. But, yes, the “Do It For Her” is the most moving example, probably. And, being a Momma’s Boy, I’m partial to any instance of Marge & Bart showing their love for each other. Like when Marge talked Milhouse’s Mom into letting them being friends again. Bart says “Thanks for sticking up for me”, and when Marge asks how he knows it was her, he says “Who else would have?” and then hugs her. That DESTROYS me every time.