I'm glad your sister is still in treatment and that your neice will be able to see mom for her birthday. It must be hard for her; under the best of circumstances little ones miss their moms if they have to be away.
I'm sorry your parents are struggling and hope that your example by attending meetings and trying to focus on you will help them to see that if they reach out to others who understand, they can find a way out of darkness too. Hugs and prayers.