Yes, U.S. citizens can receive Social Security benefits while living outside the United States, but there are some exceptions and considerations to be aware of. Generally, there's no time limit on how long you can live outside the U.S. and still receive Social Security retirement, disability, or survivor benefits. However, Supplemental Security Income (SSI) payments stop after 30 consecutive days outside the U.S. and won't restart until you've been back in the country for at least 30 consecutive days.
approx 10k US per month still a handy sum. Don’t know the name of it but I would suggest the Visa that requires 80,000 US a month annual income. I think the cost is ฿50,000 and it’s good for five years. I think they referred to it as the wealthy pensioners Visa.
it’s not the transfer company that is changing. It’s the accepted banks Thailand now has a list of about eight banks that will only accept foreign transfers. 
my Thai wife and I were married in Texas when we returned to our home in Thailand we went to the local Ahmpur (District )office. where you reside, bring a translated copy along with the original. They will check your spouses “Free to Marry Status”. Then your marriage will be registered ®️ n Thailand. I can’t remember, but you may have to send the translated copy of your marriage certificate to the Ministry of foreign affairs for an authentication stamp before you go to the district office.
question what if the country that his passport is from allows, Evisa how would they know where he was when he applied for the multiple entry tourist visa online?
If you put the city that you were born in instead of the state, that is why your application got rejected the application for the visa is misleading because nowhere on your passport bio page does it list a city of birth, only place of birth, which is the state/USA