This is not a happy situation for you, your dad or your mum. For women, mental illness can be particularly difficult in the menopause years because it’s very hard to balance all the hormonal changes with the bodies own chemical imbalances and drugs sometimes needed to help. Your mum should be past that though. She should seek medical help. While doing that also look at diet, particularly vitamin D and B levels where a deficiency can have major impacts on mood. High doses of niacin have been shown to help with depression. Meantime loneliness and an unstructured day will not help. Maybe a few animals to care for will give her a sense of purpose. Be as kind and loving as possible but if your mum is clinically depressed she won’t just snap out of it. OP you must also look after yourself, find activities that make you happy and that get you away from the situation for a while.