@Wylie ******
he can't apply for the "change of visa type" from a tourist visa to a 90 days Non-Imm-O visa, because for this process, one needs to have a minimum of 15 days left on his stay permit. Which he does not have any more and he also already blew the 30 days extension. He might be able to do the "change" from out of a 60-days "family visit extension". This he needs to inquire at his immigration office. In case they deny, all that is left is a new 60 days tourist visa in one of the neighbouring countries, or the 90 days Non-Imm-O in Savannakhet