Families are our toughest critics and comparisons between siblings can be awfully unfair. I can relate, but I also must suggest an attitude adjustment. I'd ignore the lonely old man that is making you feel like a failure and just deal with him only as necessary. Then I'd get off my butt and finish my degree and then start really hunting for job in a field of your choice. If it means dad has to go into a senior facility and his house sold to pay for it, so be it. You have a right to a life and you got to let go of all the emotional baggage before you can feel fulfillment. Good luck and get to it. Times a wasting!