Character wise, I like Jack's mom. Besides Ennis, she's the only other person that loves Jack and she seems to understand their relationship well. When she puts her hand on Ennis' shoulder, that meant a lot of understanding and compassion. I also like Alma Jr. because she loves her dad and seems to care about him. You see her rubbing Ennis' shoulder after the Thanksgiving dinner. I think she's a good daughter.
For acting abilities, I think they all shine in the roles they played.