Chris also called their father to tell him to check his bank account, reported People magazine.
"(My father) called my brother Chris back and said, 'I don't know how to feel. Since I left home, I have had debts and I thought I'd be paying them off until I died and have this weight hanging over me, and now to have them completely cleared'," Liam, 25, said.
The "Hunger Games: Mockingjay, Part 2" star added, "They are so happy now and able to spend more time with us. I would love to be able to do something for my parents like that.