can my daughter have thai citizenship and australian citizenship
She has Thai citizenship from birth. If she has a Thai birth certificate issued by the Thai embassy in Australia she can go to the registrars office at an Amphoe to be entered in a house book and get an ID card, Then she can then get a passport here.oth your duathers already have Thai nationality, as their mother is a Thai national. Bth Thailand and Australia do not have any problems with this. Your 22 year old already had a Thai passport, so already has a Thai birth certificate and can apply for a new paspsort. See Thai embassy webiste.