This movie shouldn’t work. The main family is played by an actual family, so the risk of nepotism is high. The story is full of perfect coincidences, including: the father, a construction worker, accidentally stumbles into acting in a community theater performing exactly the right play to act as therapy; the daughter gets suspended at just the right time to participate; the mother has connections to help as well; the twin climaxes of the story happen to be occurring withing a few hours of each other. But it does work. The performances are strong enough to support the ridiculous amount of suspension of disbelief required by the story.
The father and daughter get most of the meat of the story, and they both shine. I would not be surprised if Katherine Mallen Kupferer has a long and well-respected acting career.