Let your wife adopt then when have visa for your country he will go also as the luggage- i was successful. Doing this in Viet Nam for my wife’s nephew 
First visited in 1974 on a bus 14 day tour from Singapore 🇸🇬 return and the only foreigner quickly learned to use chopsticks as food was included- been returning every few years travelling to different places until 2019 now living between Thailand and Australia with my new Thai lady