Henry Fisher's world changes forever when his parents get a divorce and his blind dad appears to replace him with a guide dog.

The arrival of the new guide dog forces Mel to reveal he is blind to a client; when Henry borrows the dog, a pretty girl thinks he is blind; when Joyce's study partner validates her as cool, Katie starts to see her differently.

Mel and Henry encourage each other to pursue women in their building; Joyce panics during her first post-separation date and crashes her daughter's date at a carnival.

Mel discovers he has trust issues when he and Joyce disagree over how to discipline Katey. When Katie goes missing, Mel and Joyce have to team up to find her. Henry, needing a break from his family's drama, forces Runyen to allow him to sleep over for the first time in their friendship.

Mel undermines Katie's newfound freedom after she finally gets her driver's license.

Mel tries to prove a point to Joyce's sister, Madi (Erinn Hayes); Henry worries that he and Jenny have fallen into the "friend zone."

When the divorce papers arrive in the mail, Mel is determined to preserve for Henry and Katie a sense of normalcy, and keeps their annual family trip on the books. When Joyce's online date walks out on her, Mel grudgingly invites her along. To their surprise, while on what has previously been a vacation from hell, Mel and Joyce discover that their separation has allowed them to finally appreciate one another - just as they're ready to sign the divorce papers. Meanwhile, Henry's crush, Jenny, tags along on the vacation, which forces Henry to overcome his fear of horses so he can make the most of this getaway with the girl of his dreams.