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What this means is that PayPal takes the wholesale or mid-market exchange rates on the day of conversion or the previous business day, and adds this markup to calculate the rate used for your transaction. This makes it difficult for the user to see the full costs of the transfer, whether these are charged to their own bank account or to that of the beneficiary.
If your brother residing in UAE sends money to you in India, the money is not taxable in India. As per the Indian Income Tax Act, money received as a gift from a relative is not considered as income and therefore is not taxable. A relative is defined as spouse, brother, sister, brother or sister of the spouse, brother or sister of either of the parents, any lineal ascendant or descendant. However, it's worth noting that your brother might be subject to taxes in the UAE for sending money out of the country. It's recommended to check with a tax professional in the UAE to understand the tax implications for your brother.