SHOULD A MOTHER BE CONVICTED OF MURDER BASED ON THE TESTIMONY OF HER SEVEN-YEAR-OLD SON?

"20/20" Airs Friday, December 3 on ABC

Plus: An Eight-Year-Old Gospel Singer with a Powerhouse Voice

Whom to believe -- mother or son? Just hours after the drowning death of seven-year-old Adrianna Hutto, her six-year-old brother, AJ, had a horrific story to tell police about their mother, Amanda Lewis. He accused his mother of dunking Adrianna, drowning her in their Florida pool. But can AJ be believed, or was he coached into telling the damaging story? "20/20" explores family secrets, the challenges of child testimony, and AJ's heart-wrenching testimony at the age of seven at a trial that pits mother against son. Ashleigh Banfield's report, which includes an exclusive interview with Amanda Lewis, airs on "20/20," FRIDAY, DECEMBER 3 (10:00-11:00 p.m., ET) on the ABC Television Network.

Video preview: http://abcnews.go.com/2020/video/tragedy-pool-mama-dunked-sister-Amanda-Lewis-drowned-death-daughter-12049050

Plus: Just one year ago, Rhema Marvanne was an unknown seven-year-old when her inspirational songs, first posted on YouTube, turned her into a viral sensation. Now, more than 17 million online views later and counting, the surprisingly poised prodigy is moving beyond the internet. Juju Chang reports on the tragedy that inspired Rhema to sing and her plans for the future.

"20/20" is anchored by Elizabeth Vargas and Chris Cuomo. David Sloan is executive producer.