“The Big Bang Theory” (8 p.m., CBS): As the comedy wraps up another laugh-filled

“The Big Bang Theory” (8 p.m., CBS): As the comedy wraps up another laugh-filled season, Sheldon (Jim Parsons) puts the pressure on Penny (Kaley Cuoco-Sweeting) and Leonard (Johnny Galecki) to pick a wedding date.

“Bones” (8 p.m., Fox): A high-school student’s remains are found in a ditch, and Brennan (Emily Deschanel) finds similarities between her own teen years and the victim’s.

“Caring for Mom and Dad” (9:06 P.M., PBS): Eight families reveal the challenges of caring for elderly parents.

TV listings, B6