Part 1 of a two-part season ender features the wrenching film “A Lion in the House,” which examines the physical and emotion struggles of children with cancer over a six-year period. The first half of the documentary focuses on Alex, a little girl with leukemia; Tim, a rebellious teen who has Hodgkin's lymphoma; and Justin, who has battled leukemia for more than a decade. The film includes comments from family members, who often struggle with decisions regarding treatment options.