Tammy, Amy and their siblings sit down to watch their most memorable clips.

For the first time ever, Dr. Smith holds an all-sibling weigh-in appointment,and the moment of truth is a tough pill to swallow for some.

Tammy's skin removal surgery is still up in the air as she struggles to kick bad habits. Amy's got a new roommate and a new man. Chris' plays referee between Brittany and their new neighbor. Tammy is keeping a secret from her family.

Tammy addresses Amy about her weight gain and the family heads to Pittsburgh for Tammy's skin removal surgery.

Amy reels emotionally and physically from her camel bite and arrest. Chris explores a passion project, and Tammy expands her circle and fulfills a childhood dream.

Tammy takes a big step forward in her relationship with Andrea.

When the siblings react to Amy's proposal, relationships are fractured.

Everyone prepares for London amid another flare up between Tammy and Amanda while Chris and Tammy visit Dr. Turner hoping to get approved for skin removal surgery.

The family deals with the aftermath of Amy's meltdown. Back home, Chris gets skin removal surgery. Amy has a risqué photoshoot. Tammy finds doctors who can do her skin removal surgery but some test results force Tammy to confess a long-held secret.

Tammy gets a push to reveal her personal life to her family. Amy's life gets even more chaotic, pushing her to make a rash decision. Chris and his wife make a big decision about her health.

Tammy and Amy beef over their big night out.

A missing tool in the operating room causes delays to Tammy's extreme skin removal and Amy decides she's had enough and makes a bold move.

Tammy needs a new place to live but finds more problems than solutions and Amy makes a peace offering with some highly questionable ingredients.

Chris gears up for his upcoming appointment with a plastic surgeon and encourages Tammy to tag along.

Tammy has her heart set on skin removal but is met with a roadblock.

A time for cheer is met with jeer as the entire family remains divided during Christmas.

Tammy reveals to her sisters that she's dating a woman and their reaction surprises her. Chris and Tammy check-in on their skin removal progress, and a harrowing moment at the petting zoo sees Amy's life turned upside down.

Tammy announces her engagement to the family and reveals that her big day is only two weeks away; Amy takes up maid of honor duties; the family wonders if there's another reason Tammy is rushing down the aisle.

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The family arrives in London for their first international vacation and learns even more surprising news about their ancestry.

Tammy's seemingly good progress inspires Amy to visit, reuniting the siblings for the first time in months; Amanda begins a new chapter in her life; Amy learns she's at risk of serious complications if she doesn't get her eating under control.

Tammy wants to come home, but a setback causes a major blowup between her and the family.

Tammy takes small steps towards independence, Amy moves home but struggles with ghosts of the past, the sisters get new looks to go with their new attitude, and an upcoming Dr. Smith appointment has everyone on edge.

Having survived yet another brush with death, Tammy recovers at rehab, but a new scare threatens her life; the family adjusts to life without Tammy; Amy's big surprise stuns everyone.

After finding out Tammy's been robbed, Misty and Amanda visit to break the news in person; while Chris pushes ahead toward his surgery goal, Amy has a setback and is rushed to the ER; with her sisters by her side, Tammy faces the results of her weigh in.