Receiving foreign cash gift from parents who are US green card holders

My parents (green card holders) just moved to the US. They want to gift me few thousand dollars ( online transfer from their foreign account to my foreign account) . I declare these accounts in FBAR /8938 and they do the same.

The question is: Do I have to file 3520 or they have to file 709 ( even if the its less than 15000 $)