"You're Not Taking My Kids" episode
This was the first episode that literally had me in tears. From the kid next door helping his young friend, to the haul-away manager arranging for new beds and electrical help, to Dr. Becky tearing up over the state of the pet dog... Wow, what a great show of compassion on the part of everyone involved.
(I have to add that Dr. Beaton is my favorite psychologist on the show. I can't imagine any of the other regulars handling this case. She has the kindest and most caring demeanor of them all, imo.)