Sending money home, Please advise

Apologies in advance for my noob Finance question.
Due to some financial circumstances, I am sending around 2 million Yen to my parents back in home country (not US). I do send them money occasionally but its always under 100k JPY, and its first time I am sending an amount this big.
I will be using Transfer Wise app for the remittance.
I have following questions. I will be grateful if you can answer or advise.
1) What are the precautions I should take when sending this much amount?
2) Should I send the money in one go or in multiple transactions?
3) Since my parents are my dependents, Can I get a tax refund on this amount in Japan?

Additional info: I am 30, Male, working as full time employee in a company.

by WriterFragrant6716

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