You can openly talk about this to your wife and make her understand why you don’t want to do this job. You should put your point and make it understandable. You can also talk to your father-in-law and discuss this with him. Communicate with each other and also try to understand their point of view as it is important to listen. You can look for good reasons to join this company and start working there. This is for your own good, you will earn better and can spend better life, do savings, and give a good upbringing to your kids in future.