Hello Arkjar,
I probably should let Dr. Laura answer this, (I'm a lot bigger and hairier than her..), but here goes!
It's time to stand up to your father-in-law and defend your wife. If your both adults, (and not living in his house), you should be defending your wife, and possibly the mother of your kid(s). She is your immediate family now, and he is being disrepectful to you, by talking to her (your wife) like that in front of you, (or even to her or other people). Before anyone yells at me, I understand, the fact that he is her father and her blood, gives him some right to sometimes maybe be mad at her, or give her advice, or disagrree with her about things etc.., but not to talk to her with those mean comments. Just because she is a wuss and takes it,doesn't mean you should not defend her. I'm not talking about fighting with him, just a stern talking to. "I will not let my wife be spoken to like that in my presence, that's disrepectful". He might even admire you for standing up and realize his words were nasty." If you live in his house, and you thought you were mature and grown up enough to get married, do what ever it takes to get you and your wife your own place. I take it you're a Marine, that's awesome, and for years the greatest fighting force in the world, the U.S Marines have been standing up for people not strong enough to do it themselves! Get my drift...