If he has a yellow book with his name in it, he doesn't need a resident certificate

@Stuart ********

You use neither. You equivalent in Australian dollars in an Australian bank

@Keith ******

2 months for first extension and 3 months for subsequent ones

You'll need an invitation letter from your mother for a place to stay in Australia. And another from you saying you will provide financial support for the trip and ensure she obeys the visa conditions. And any other information you can give about her circumstances that would ensure she leaves, job, cars, property and family in Thailand. Good luck.

@Bruce ****************

It's pronounced more like Boo, means Crab ปู

@Alex *********

Do a border run and get stamped in for another year on your O-A You get stamped in for 1 additional year on each entry within the visa validity period. But you'll need a reenry permit if you travel outside Thailand during the second year.

@Kool ******

What can a bbk account do that a K bank account can't? Nothing

Get 2 accounts. Transfers are free. What's the problem?

@Kamren *******

FFS, lucky they let you in at all!

You can go to immigration again and explain and they can give you a 7 day extension denied stamp to cover you.