Some embassies will let you get the DTV and not show extra funds for the dependants while others want the 500K THB for each person even children. Best to check with individual embassies cos obviously it is a huge difference Good luck
Yes it must be flagged into your Thai bank account as from overseas I think the drop down has something about long stay in Thailand. Then when you present documention/statements at immigration all the deposits will be flagged as coming from outside Thailand
from posts in visa groups at the moment there wouldn’t even be 1% with success stories and what’s worse is even at the same bank and branch one person will succeed and the next will not