As an NRI living in the USA, you may be subject to US tax laws on any income you earn or receive in the US. In general, the US tax system is based on the worldwide income of US citizens and residents, but the rules are different for non-resident aliens, including NRIs.

- What documentation is required when this amount / gift is returned back to me or my spouse after few years?
As we mentioned above, Xoom is not available in India. This is because Xoom is currently only available to residents of the US, UK, Canada, and the EU/EEA. The good news is that if you'd like to send money to the US, you'll have plenty of options to choose from instead. In summary, here are the main two:
Once you have money in your PayPal account you may want to withdraw it to your regular Indian bank account or card. There may be a fee for this service, depending on exactly how you want to process the withdrawal. Here are the PayPal India withdrawal fees for consumer accounts:
1.The property must be for the PIO's residential or commercial use.

If the gift you receive exceeds $100,000, you will need to fill out an IRS Form 3520. Gifts from a business or a partnership that exceed $17,339 also require that you file Form 3520. You are not required to pay taxes on this amount; however, if you fail to file this information, you could incur a fine of up to $10,000.
Useful article, may add a para on bank/ IT formalities as well. SOme banks ask for specific forms from auditors to send gift money to NRIs.
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When you send money to any person abroad in India, the first $15,000 USD will be exempt from taxes by the IRS under the Gift Tax policy. This limit is charged on a per-person basis -- if you would like to send $15,000 USD each to multiple persons, you will still be off the hook for any gift taxes.
When you send money to any person abroad in India, the first $15,000 USD will be exempt from taxes by the IRS under the Gift Tax policy. This limit is charged on a per-person basis -- if you would like to send $15,000 USD each to multiple persons, you will still be off the hook for any gift taxes.