I was stuck in this mofo for 2 days until I finally figured it out: What you need to do is follow the objectives until you get to the wife. Once there, tell your team to follow you and stay inside the structure where the wife is. Then tell her to follow you but don't go anywhere, just stay there inside with you and your team aiming at the door. soon enough about 3 or 4 tangos will try to come in through the door. Gun 'em down! When no more are coming, tell the wife to hold, go out (just to the steps) and right in front of you a couple of tangos will be coming, shoot them, have your team cover your back at all times. Take your team and do a reconossaince of the area, make sure no more tangos are around (while all this is going on, make sure the wife is back at the building, not following you. When no more tangos are around, fetch the wife, tell her to follow you then call for support and that's it. The rest is actually easier.
Good luck
Goin' cold.
PS
I was getting stuck before I even reached the wife since they will kill her if you take the wrong path but the bloddy map didn't show me which path was the right one. It was extremely frustrating. I finally got the right path, saw some people in a structure far off, by this time I was very tired and couldn't see properly, through my scope the wife looked like a tango with a red robe, I thought it was an enemy and shot her
after all that work!