Anonymous participant The embassy want to know what are you present to them. They will grant you if you are truth and believed by the thai embassy and not lie to them. So, they give your visa.
The embassy agent can see what about everything in the passport, document present about you, proof of financial asset what year and month birth. If your birthday age is 20 passed, you will apply for DTV visa
It is not recommend while before visa approved while you go outside another country. The embassy will rejected you and serious check again if you do it again.
First, you will do new passport at your country embassy in bangkok
Second, you carry old and new passport to the immigration near your living and the agent at the immigration can do stamp reference in new passport from old passport
You explain relationship about your mother is sponsor for you and why she sponsor for you in one paper included family certificate that your mother and you is real family. The Thai embassy will believing you why you explain and the certificate sponsor by your mom.