Regarding booking for ANA flight to Haneda, unfortunately NH848 on 30JUL is completely fully booked.
I put him on the waiting list and sent you the flight itinerary.
Return flight is also very congested, so even if the flight is confirmed, the cost will be THB52,500+THB4,155(Taxes), yes, it is quite expensive.
Just in case, I have confirmed with following TG flight but TG660 to Haneda arrives at 910PM, is it okay for him?
TG660/30JUL BKK/HND 1300/2110
TG661/03AUG HND/BKK 0020/0450
Air fare – THB36,900+THB6,835(Taxes)
How about is the date of birth for his children?
For your information, baby bassinet on TG international flight is allowed for infant who is less than 6 months, up to 67CM of height and 10KGS of weight.
If exceeded, it is impossible to request and confirm.