My mother is non-Muslim. She has a hard time standing up so I go to her house once or twice a week to help her clean. Is it haram for me to wash her dishes, she eats pork and other haram foods?
بسم الله الرحمن الرحيم
(Fatwa: 1119/1114/N=09/1435)
You may visit your non-Muslim mother and help her in cleaning etc there is no harm rather it is a task of virtues and reward. Islam emphasises highly to behave parents in good way and serve and help them. You may also wash her dishes. However, you should not wash dishes in which any haram thing is cooked or eaten, and let your mother wash it.
May Allah give your mother taufiq to accept Islam! Amen!
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband