I could understand your mother worrying about her financial stability, if your father's wasn't in such poor shape. That'd be one thing. Or if she was still raising kids they had together.
But for her to be like this with the shape your father is in is a whole other story. It sounds like she needs some sort of intervention.
If your dad can't stand up for himself, you should stand up for him. There's unfortunately not much else that you CAN do.
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See You In Another Life, Brother.
God, too busy to help the broncos on Sundays, gave them Manning