Answer:
The mother
Explanation:
Personally, I'd rather have my mother stay alive than my sibling. To begin, there's a high chance that the mother is still able to bear children. Next, seeming as the mother is in critical condition, it's likely that the sibling could be born with a defect, or multiple. And lastly, if the mother were to die, it would be difficult to raise the sibling with the limited experience with parenthood that I have. So, to conclude, I would rather my mother continue to live than my sibling.
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-Ren