Father is alcohol dependent, that needs to be treated first. If he is not motivated, he should be motivated first. Second is your mother need support. If she is too much depressed, medication is needed. Third thing require is interpersonal therapy or counselling to build good interpersonal relation that require some times. For alcohol problem medication are available that may be of help but motivation to quite alcohol is required.
Next Steps
treatment of alcohol problem and depression
Health Tips
meditation and yoga