Hi there,
I wonder if the situation got any better since you posted this issue.
If it hasn't I would like to suggest a totally different approach as follows:
Call your doggie when you and your wife are sitting next to each other on a sofa or on the floor. You should have some treats in your hand.
Ideally, place your doggie in between you and your wife and have your wife tell him be nice to you as you give him treats little by little. This is to reassure him that you are not a threat to him nor to your wife (I know this sounds ridiculous
.
Keep doing this until he learns that both you and your wife are the human members of the family, who are equally caring him. It would help a lot if you feed him all his meals, instead of your wife.
Also, make as many opportunities that you and him being alone without your wife. A best thing is to go dog training classes but just being home playing together is fine too.
I hope this will help
. Good luck!!