Correct, if you stay in a private property the question is who invites you into that property. You can change the place where you stay in f.e. hotel or guesthouse
Yes, you can use the visa to do a border run and get a new 1 year stay BEFORE the valid until date on the visa, or apply for a 1 year Extension of Stay at local Immigration before your Admitted until date stamped in your passport.
Time to close, people have to fly from a country to Thailand and enter Thailand, with a birth certificate that does not going to happen, passports are needed.
Not financially fined for overstay only works for people who got a stay inside Thailand, I do not know the rules in Australia.
The way to apply for a Thai passport for a Thai person in Thailand has not much to do with Thai Visa Advice.
yes, 90 days on entry. plus 60 days extension based on visiting family, makes 150 days. BUT be aware that some Immigration Offices only allow 1 (one) time this 60 day extension during the complete life time of the visa.
IF you have the 1 year Multiple Entry Non Immigrant O visa, you get 90 days of stay, just before the last day, you make a border run to get a new 90 day period.
There is no 30 day Extension of Stay possible on this visa, depending on how long you like to stay inside Thailand, you might ask for a 60 day Extension of Stay to visit family.
NO, a Visa is issued with different dates on it and used to enter Thailand.
You can not renew it. You can apply at a local Immigration Office for an Extension of Stay based on being over 50 years of age, visit the office first to show your passport and visa and ask the hand out with requirements.
Best option is for both the Multiple Entry Non Immigrant O visa, as for the Extension of Stay based on Thai Children you need to have parental rights from family court or Amphuer depending on age of the child.
Just a birth certificate is not enough for an Extension of Stay at Immigration.