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Gift Tax and LLC with foreign partners
The LLC portion is completely irrelevant. Don't know why you want it. You can create a joint/partnership trading account without the additional complexity of having LLC. What liability are you trying to limit here? Her sisters will file tax returns in the us using the form 1040NR, and only reporting the dividends they received, everything else will be taxed by Vietnam. You'll have to investigate how to file tax returns there as well. That said, you'll need about $500,000 each to invest in the regional centers. So you're talking about 1.5 million of US dollars at least. From a couple of $14K gifts to $1.5M just by trading? I don't see how this is feasible.