Do you think a sibling should thank anotehr sibling for taking care of their mother?

I mean isn't that part of theri children duties? To take care of their mother if she is elderly. Why giving thanks? I mean a sister is giving thanks to another one for taking care of their mother since one sibling can't do it 24/7 as she is married and live apart obvioulsy.

Do you think a sibling should thank anotehr sibling for taking care of their mother?
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