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The reason why my gpa is low is because during two consecutive semesters I had to go back and forth from school to my home city where I had to check up on my homeless and mentally ill brother. The problem I am having is that if I write this the wrong way they might view it as a problem that won't go away.

Any help with this problem will be greatly appreciated.

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Thanks for the advice. I now feel a lot more confident that my addendum will help more than hurt my chances.