Things get serious on the season finale of Modern Family (8 p.m., ABC/Ch. 4) when Phil's mother dies. The family travels to Florida for the funeral.Viewers never got to meet Phil's mom, although we've seen his dad multiple times. And Fred Willard returns tonight in that role.This is one of TV's best comedies, and - not surprisingly - there are lots of laughs as well. Claire helps Phil with Gracie's last wish for Frank, and the kids reflect on the gifts grandma left for them. Gloria has to contend with an outstanding arrest warrant in Florida, Cam finds himself fitting right into an elderly women's group at Frank's retirement community, and Jay runs into a pivotal person from his past.Elsewhere on TV ...The Middle (7 p.m., ABC/Ch. 4): Frankie plans a big graduation party for Axl, who doesn't want one. (Season finale)MasterChef (7 p.m., Fox/Ch. 13): A new season of this cooking competition begins.Family Tools (7:30 p.m., ABC/Ch. 4): Tony starts dating.Criminal Minds (8 and 9 p.m., CBS/Ch. 2): The Replicator is out to get a member of the BAU team. (Season finale)Law & Order: SVU (8 p.m., NBC/Ch. 5): Benson is in mortal danger. (Season finale)How to Live With You Parents (For the Rest of Your Life) (8:31 p.m., ABC/Ch. 4): To deal with stress, Max overeats.Nashville (9 p.m., ABC/Ch. 4): Deacon confronts Rayna. (Season finale)Chicago Fire (9 p.m., NBC/Ch. 5): Herrmann's wife goes into labor. (Season finale)Psych (11 p.m., USA): Shawn and Gus suspect a plastic surgeon killed one of his patients.