if he owns a property by the beach can rent it out and live somewhere cheaper, lots of extra income then. Kids cost a lot for westerners because they make it so. Got two nieces take out all the time. I used to live by beach with my son was great the sea is very cheap. I got Condo in Bangkok houses in samat sakorn and ratchaburi dont find its 40 % more expensive in Bangkok but i dont drink and go out fancy dining
for less than one month renting is not allowed, your answers are confusing. As its a friend staying as she says in post its not a commercial transaction.