Bro-in-Law Stress !!?

[why me]

First off...my wife's brother is genually a nice guy, but it's just been TOO long. I will refer to him as "Annoy". Annoy is my same age (33), never keeping a job longer than a week until soon after living with us. Me and my wife lived together about 4 months before we were married, 3 years ago. Annoy moved with us and has been here ever since. He has always been a drinker and always gotten into trouble for stupid stuff with stupid friends. He had his license revoked for 4 years, so has no way to get anywhere. My wife (whom I love with all my heart), thought it would do him some good to live with us for a while. When we moved into our new home before we were married, I was not given an opportunity to share my opinion on him moving in. For the past 3 years, we have had to pretty much "raise" him - taking him to work/picking him up, making sure he gets to the grocery store, teach him about a checking account that he's never had until 2 years ago. He does pay $300/month rent, but pays it when he "has" it - but always seems to have money for beer, cigs, strip club, and other stupid things. My wife once gave him $1500 so he could buy an old truck - remember, he dont have a license, so the truck has sat in our driveway for 2 years just so he can sit in it and crank it up...But we didn't have money at the time to do the things that we NEEDED to do or wanted to do. I keep getting told that in October of this year he will get his license back and he will then be gone, but I cant help but wonder...how does a man get his own place when he has not been saving any of his money for the past 3 years??? He does have a full time job, but spends it on beer/cigs - he never spends more than $40/week on groceries, and other than his rent he only has to pay for a cell phone, so I just dont get it ! Me and my wife are now expecting twin boys, due in about 5 weeks - and we have NEVER been alone since even before we were married. Why is it our responsibility to continuously take care of him when he is perfectly capable of taking care of himself ?? My wife's parents live 15 minutes away but yet we are still housing him. I have tried to talk to my wife about this on countless occassions, but she does not want to hear anything about it. She gets mad at me every time I bring it up and it just turns into a huge fight - but nothing ever gets resolved. I can never finish a conversation with her regarding this - I have absolutely no say so in this matter ! Annoy is honestly like having a teenager - actually, my 16 year old nephew is twice as mature as Annoy. I am at a total loss of what to do. My wife dont ever want to talk about it, I am going crazy over it, my bitterness from the last 3 years is hurting our relationship , and we are about to bring 2 babies into this very very soon. I am clueless on how to get through this !!! Any suggestions???