the law is if you can’t bring in more than 10k of your money in so unless your kids can prove it has come from their accounts they can take it from you at the airport
I’m with Bangkok bank and I go in at 10 when it opens they do me a letter and I take it with the updated bank book.However last year I was home for 7 months and was told it was not detailed enough and the immigration guy asked me to do a print off of my statements and could do this through the app. It was because he did not know if I went below 400k. Different rules in different situations FYI