my son and his wife went overseas and the wife hooked up with her boss and she wants a divorce, can my son recoup the monies he would have made

I am not sure if I understand what you are asking when you say, "can my son recoup the monies he would have made overseas?" Your question cannot be answered in this forum because it is too broad and will require considerable more details.  For example, how long did your son and his wife live overseas? Was he fired? If so, what was the basis of his dismissal? Was he on probation with his new job? Is there a connection between the daughter in law's affair and the cessation of his employment? How do you prove loss wages and or the connection between the affair and the loss of employment, etc.,    Lawyer.com offers general information and not legal advice.  If you want specific advice, kindly contact a  lawyer in your area to discuss the matter in greater details.  Please note that lawyers charge by the hour; therefore, unless otherwise stated, you will be charged for an initial consultation.  Best of luck~