Does anybody knows when John got married for the first time,
and what?s the name of his first wife?

His first wife's name was Martha. Don't know when they got married & divorced though. They had at least 3 children together.

Thank you, Prisoner! Don?t you know the children?s name?

I think his first son is named Josh

Martha info
 

John married Martha in 1965. They had three children together: Josh, Laurie, and Sean. I'm having a hard time pinning this down, but from the information that I can find, it looks like Martha died in 2020 or 2021. Does anyone know for sure? It seems like John has a much stronger relationship with the children he has with Julie.

That's very sad, to know that John's first wife, Martha, has passed away.