My sister got jealous that my partner gifted me and now decided to go on a vacation and leave her 3 kids behind for me to take care for?

i feel so furious that she would actually become so jealous and dump all her responsibilities on me. she emotionally blackmailed my parents into saying yes and imposing all her responsibilities on to me. even my parents were hesitant to say no cause of her anger issues. what should i do?

My sister got jealous that my partner gifted me and now decided to go on a vacation and leave her 3 kids behind for me to take care for?
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