noun
BAD : My obligations include doing the housework and picking up the children from school.
GOOD : My duties include doing the housework and picking up the children from school.
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obligation = moral duty or responsibility: 'Having promised to cut taxes, the government now has an obligation to do so.' 'Anyone who rents a property is under an obligation to keep it clean and tidy.'
duty = what you have to do because it is a part of your job or because you think it is right: 'One of the principal's main duties is to improve the quality of teaching and learning in the school.'