According to form 3520 instructions, a 3520 must be filed if you more than $100,000 from a nonresident alien individual or a foreign estate (including foreign persons related to that nonresident alien individual or foreign estate) that you treated as gifts or bequests;
Interpreting this, if his dad and grandma are related, then the gift needs to be reported on the 3520 if the total from both is more than $100,000.
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