Is it possible? I have already one extension and would like another 60 day extension.

I guess you are talking about a 60 day extension based on Thai wife/child?

No, it cannot be extended for another 60 days. The most you can get is an extra 7 days for 1,900 baht.

Thank you

Thank you

This may well be one of those things that differs from office to office, but in Khorat Immigration they advise to leave at a border crossing and come back on a 15 day exempt. They will then extend that for 60 days based on marraige or having a child.

It depends on his nationality, but provided he qualifies for visa exempt entry it is the normal way people do it.