Nana Gallagher Had an Affair

S1 E10: Monica's return to the family wreaks havoc on the Gallagher clan, leaving the children determined to find out if Frank is their real father. Fiona, disgusted with Monica, moves in with Steve next door and tests the waters of living outside the Gallagher home. Karen decides to trust Eddie and his seeming desire to be close to her when she agrees to join him at the Purity ball. Frank hits a new low when he uses Carl to stop a disability worker from tampering with his free money from the state.