"There's something missing, and that was our mom." They were just two-years-old and six-months-old when their mom, Denise Amber Lee, was abducted and killed. Now, they said they're speaking for their first public interview in tonight's all-new 20/20 so people can learn "how amazing she was." Watch Deborah Roberts' report "Life on the Line" premiere tonight (Oct. 10th) at 9/8c on ABC. Stream this weekend on Disney and Hulu. | ABC 20/20