Our expert says:
You don't mention your ages, but I'm guessing your sister is rather young, maybe teenage ( or whe wouldn't need you to be looking after her). As you know, some girls are especially attached to their father, and may react badly to his death, and may rebel against alternative people in charge of their lives or advising them. I think Liza's comment is wise, and worth thinking over. It's good of you to want to help her, but don't take too much responsibility if she ignores your advice.
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