Shameless - Season 4 -

: Following Fiona’s arrest, Lip takes over as the primary caregiver for his younger siblings, leading to intense friction between him and Fiona. Ian’s Return and Mickey’s Coming Out

: Fiona is arrested for child endangerment, faces imprisonment, and is forced to confront that she has inherited the same "Frank-like" tendencies she once despised. Lip’s Evolution and Responsibility Shameless - Season 4

: Ian returns after going AWOL, exhibiting erratic and hyper-sexualized behavior that the family eventually identifies as bipolar disorder, mirroring their mother Monica. : Following Fiona’s arrest, Lip takes over as

: To prove his commitment to Ian, Mickey publicly comes out as gay during a bar brawl at the Alibi Room, marking a massive departure from his previously repressed, violent persona. Frank’s Mortality and the Arrival of Sammi : To prove his commitment to Ian, Mickey

The central arc of the season focuses on Fiona's transition from the family's "emotional anchor" to a legal and moral outcast.