Maci discusses the status of her relationship with Kyle, and Gary reflects on his journey with Amber in the conclusion of this series-finale special, hosted by Dr. Drew Pinsky. Also: Leah, Bentley and Sophia share the stage one last time.
In the series finale, Ryan confronts Maci about their custody arrangement, while Amber has second thoughts about giving Gary full custody of Leah. Also: Farrah misses Sophia; Catelynn and Tyler reflect on the adoption.
Maci and Ryan fight over Bentley's birthday; Farrah spends time with Sophia before leaving for a month; Amber and Gary agree on a custody plan for Leah; Catelynn and Tyler help their parents deal with their issues.
Farrah visits Texas and challenges Daniel about their relationship; Maci and Ryan fight over Ryan's new girlfriend; Amber searches for a new home for herself and Leah; Catelynn and Tyler have difficulty making a decision about college.
Farrah's mom meets her new boyfriend; Catelynn supports her mother as Tyler's dad goes to court; Bentley struggles to adjust to Maci's new house; sharing custody of Leah continues to be a problem for Amber and Gary.
Farrah visits her parents and becomes annoyed with their concerns for Sophia; Catelynn attends a birth-parent support group with her grandmother; Amber and Gary work on their relationship issues; Maci has a hard time choosing her classes.
Catelynn and Tyler have an emotional visit with their daughter, Carly; Amber misses her daughter, Leah, during her first weeks of rehab; Farrah says good-bye to her life in Iowa; a disagreement with Ryan disrupts Maci and Kyle's relationship.
In the Season 4 premiere, Amber prepares to go to rehab; Maci enrolls Bentley in day care; Catelynn and Tyler celebrate Carly's second birthday; and Farrah has a change of heart about leaving Sophia behind when she moves.