1000-lb Sisters, Recipe for Disaster

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.

Dr. Smith holds an all-sibling weigh-in appointment, and the moment of truth is a tough pill to swallow for some. With her recent makeover, Amy looks ahead to her new life. Tammy and Amanda's long-running sibling feud reaches new heights.

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

A time for cheer is met with jeer as the entire family remains divided during Christmas, and Amy celebrates her first Christmas as a single mum, and decides to try on heels for the first time ever.

Chris gears up for his upcoming appointment with a plastic surgeon and encourages Tammy to tag along. Amy whips up dinner for the whole family, however, dinner gets thrown into chaos when one of the siblings drops some big news.

As the family reels from Amanda's news about moving to Florida, Chris comes up with a plan to convince her to stay. Meanwhile, Amy, and Tammy are excited to have a fun girls' night out, but they quickly learn their idea of fun is miles apart.

Tammy and Amy beef over their big night out, Chris and Amy see a genealogist, and the results make the family consider taking a trip overseas, and the family decides to do a 5k but tempers quickly flare.

Everyone prepares for London amid another flare up between Tammy and Amanda. Chris and Tammy visit Dr. Turner hoping to get approved for skin removal surgery. The family participates in a 5K and Amanda makes her move to Florida.

The family arrives in London for their first international vacation and learns even more surprising news about their ancestry. Tammy is pushed to her physical limits and a major meltdown puts the rest of the trip in jeopardy.

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 forces Tammy to confess a long-held secret.

Tammy, Amy and their siblings sit down to watch some of their most memorable clips from the past seasons, and clapback at comments from viewers.