Jenelle is back with Kieffer after bailing him out of jail; Chelsea debates giving Adam another chance; Leah looks for a job; and Kailyn takes Isaac trick-or-treating.

Jenelle is living in her car with Kieffer; Leah is devastated to learn Ali will have to be sedated for an MRI; Chelsea re-tears her ACL; and Kailyn can't afford to live on her own.

Kailyn moves out without telling her mom. Jenelle files charges against Kieffer. Chelsea relies on Adam to take care of Aubree while she recovers from surgery. Corey and Leah get emotional during Ali's MRI.

Ali's MRI comes back negative to the relief of Leah. Jenelle juggles finding peace with her mom and dealing with Kieffer's domestic charges. Kailyn tries a new form of birth control. Chelsea fends for herself after surgery.

Kailyn adjusts to being alone for the holidays, while Chelsea and Adam reconcile. Leah works to make a memorable Christmas for the twins and Jenelle regrets filing charges against Kieffer.

Chelsea learns a friend of hers is pregnant, while Leah is horrified to learn that Aliannah may have a genetic disorder. Kieffer and Jenelle have a court date set for them and Kailyn becomes annoyed with the men in her life.

Kieffer is upset that Jenelle hung out with an old boyfriend. Leah is relieved that Ali has no major genetic disorder. Adam slips back into his old ways, much to the dismay of Chelsea. Kailyn considers filing for child support.

Jenelle moves in with her best friend Tori after fighting with Barbara, and Kieffer reenters the picture. Chelsea's relationship with Adam is going downhill fast. Ali may still have a genetic problem. Jo confronts Kailyn about filing for child support and they get into a big argument about who is the more responsible parent.

Jenelle fights with both Kieffer and Tori. Chelsea struggles to deal with Adam breaking up with her. Leah is livid when Corey wants to buy a truck instead of moving. Jo appeals Kailyn's child support request.

Kailyn's child support hearing is postponed and Jo meets Jordan for the first time. Jenelle has her day in court for the breaking and entering and possession of marijuana charges. Chelsea struggles to get over Adam. Corey finds out that Leah cheated on him two weeks before their wedding.

Jenelle decides to go to rehab. Chelsea finds a GED class at a local college, goes in for a consultation, and takes her first practice test. Leah files for divorce in order to protect her custody rights. Jo visits Issac during the week and Kailyn hooks up with Jo, even though she's still with Jordan.