it's just 1 day...that too when her son had to study. come to think of it, you too could have changed your plans instead, isn't it?
it's not about taking any side, but i think you are clearly making an issue out of nothing. just because she is your brother's wife, she is not obliged to make you feel comfortable, even when she will otherwise be busy and concerned about her son's study. i think you too would have done the same in her place, trying to make your son revise instead of entertaining guests.
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