Technically, yes. A nonresident must file a tax return for any income received from US sources. However, the tax bill on $3 USD is less than 50 cents so it would round to zero. So there isn't a point in filing.
Going forward your relative can ask the partnerships that he is invested in to withhold taxes for him. If taxes are withheld then there is no filing requirement in the US unless you would like a refund. So your relative's tax bill would already be settled.
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