Should household chores be done by the university student child or the high school student child?

When my mom asked my younger brother to cut a cucumber, he responded with 'Let my older brother do it.' I’m 21 years old, and he’s 15. He never even sets the table, while I always help my mom with housework. Do you think this is normal, or should I have a serious talk with him about it?"**

Should household chores be done by the university student child or the high school student child?
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