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

Mel freaks out when he finds marijuana in Katie's bag -- only to discover that Joyce put it there; Henry worries that he will lose his sight.

Mel needs to find a plus-one for an important charity event; Katie tries to assist her dad so the secret party she is planning at his apartment won't be jeopardized; Joyce defends her family's honor.

When Mel thinks Henry is becoming a slacker, he takes him into work to show him what success looks like. Seeing his dad in action, Henry learns an unexpected lesson that helps him step out of his father's shadow. Meanwhile, Joyce and Katie decide that in Mel's absence, they need to stand up for themselves, which makes for a couple of bold, and embarrassing, confrontations in the returns department of a furniture store.

Joyce struggles to keep a secret when she discovers Katie has big plans with her boyfriend; Mel embarks on his third first date with Allison.

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.