So sorry to hear about your Step Father. And I must commend you for wanting to help out and comfort your mother knowing that she was unable to comfort you when you needed it.

You are helping when you listen. You don't have to give her answers, just listen and let her release.

As far as doing errands for her, she might prefer to get out and do them herself and have something in her life she has control over. It might be nice if you could just come and sit with your step father to asuage her fears.

Again, best to you and yours. I am sorry you are having so much pain in your life right now.
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