at least you can buy some more time when you apply for the 60 days based on family relations, but you cannot start an application for an EOS with a Non-O based on marriage out of this extension

if you got the 400K THB on your account, you can apply for the Extension of Stay based on marriage on your Immigration inside Thailand

if you were issued a Multi Entry Non-Imm-O based on marriage, it must be a 1-year visa. Otherwise since you say you got 90 days permitted stay, it must be a Single Entry Non-Imm-O visa. Okay, and "whats about getting extensions of stay" comes down on the finances. For an application for a 1-year EOS you either got the required 400,000 THB on your Thai bank account for 2 months, or you can prove 12 months of money coming into Thailand from abroad 40,000 THB per month. That's the financial requirements next to a few others (proof of marriage status etc)

please do not forget: they will get checked in Hanoi upon check-in. If they can't supply the documents, there will be no boarding

the boat option is still doable, as is the land border entry into Thailand . . the flight being the seemingly quickest solution, and the land border the "easiest" crossing . . wish you all well . go ahead and don't you worry too much

wishing you good luck!

I like to keep strict with wording. OVER & OUT

pleeze Ivan , forgive me

it is always shocking to learn that there are "visa" which do not even exist

y'all seem to be privileged or have some high connections 😅😅😅