Behind the Waterfall.

After the death of their father, brother and sister Tommy (Luke Baird) and Becky (Gena Gale Burghoff) are sent to live with their aunt for the summer. The siblings' grief lightens when they meet kindly old Irishman Mr. Connors (M*A*S*H's Radar, Gary Burghoff), who reignites their capacity for joy and wonder.