What was the lifetime movie called where this married couple would adopt kids and toture them?

its about a married couple adopted 2 kids, 1 17 year old girl n like a 9 year old boy. this couple had adopted b4 but that boy died. the couple would torture them. they lock the girl up in the attic and leaves her up there. the wife puts stuff in the boys food which makes him really sick. when he was really sick she put this oven cleaner stuff on his back n scrubbed his back with a metal scrubber to scrub oven n stove tops. they eventually get away cause the girl escapes n tells the adoption agency person.