you must apply for the metv not the single entry. If you got the single entry you get 60 days and extension is done at immigration not the airport. Single entry visa is not a multiple entry
did you apply for the TR60 single or the TR60 multiple entry. The Multiple is the one that suits. If it expires on the 8 June you could re-enter Thailand on the 6 or 7 june and get another 60 days
You have a 60 day tourist visa, Valid until 8 June ? Is it single entry or the metv ?
You will get 60 days on arrival 5 April. Your wife can get hospital to help get the 30 days extension, you can also get the 30 days extension at immigration total 90 days each.