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.

When Katie rebels against her parents, Mel and Joyce must team up to teach her - and themselves - a valuable lesson.

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

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.

Mel sneaks into Joyce's house to take bubble baths; Joyce panics over her success at school; Katie gets a secret job; Runyen helps Henry prepare to fight a bully.

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.