Tonight on Mom (8:30 p.m., CBS/Ch. 2): Gabriel's wife thinks he is cheating on her - and she turns to Christy for support.And it was Christy who was having an affair with Gabriel, although she ended it.Sheesh.Elsewhere on TV ...NFL (6:25 p.m., ESPN): Miami Dolphins at Tampa Bay BuccaneersHow I Met Your Mother (7 p.m., CBS/Ch. 2): Barney accepts challenges from Robin and Lily.Dancing with the Stars (7 p.m., ABC/Ch. 4): The competition continues.The Voice (7 p.m., NBC/Ch. 5): The top 12 singers perform.Bones (7 p.m., Fox/Ch.13): A sperm donor is murdered.Hart of Dixie (7 p.m. CW/Ch. 30): Zoe and Joel look for somewhere to live.NBA (7 p.m., ROOT): Denver Nuggets at Utah Jazz2 Broke Girls (7:30 p.m., CBS/Ch. 2): Caroline's date stands her up.Mike & Molly (8 p.m., CBS/Ch. 2): Molly does research for the crime novel she wants to write.Beauty and the Beast (8 p.m., CW/Ch. 30): Cat confronts her birth father.American Experience (8 p.m., PBS/Ch. 7): First half of an excellent two-part, four-hour biography of "JFK."Sleepy Hollow (8 p.m., Fox/Ch. 13): Abbie and Ichabod search for clues to prevent the evil from spreading.Men's college basketball (8 p.m., ESPN2): BYU at StanfordHostages (9 p.m., CBS/Ch. 2): Ellen tries to decide if she should save Duncan.Castle (9 p.m., ABC/Ch. 4): A relationship therapist is murdered.The Blacklist (9 p.m., NBC/Ch. 5): Liz learns of a plot to destroy the country's financial system.