How to get a 19 year old to grow up??

My 19 year old son moved in with us a couple of months ago... My uncle and his wife adopted him when he was a baby (long story) anyway... He always "hides" in his room downstairs, sleeps all day up all night. Always on facebook.. Isn't actively looking for a job ( He has put a couple of applications in since he has been here, only because i have told him that he needs to get a job.) Gone for days at a time and I have no idea where he is, or when he is coming back. We had to put alcohol that we have had for years in our bedroom, because he decided to help himself to it.. I told him before he moved it that he would have to get a job. I know how hard it is to find a job (I have been filling out apps for over a year) But, he won't get one if he doesn't look for one. There are 4 people living here and soon to be a 5th, I am pregnant. My husband is nagging me about my son and it just pisses me off and stresses me out even more. I don't know what to do.. If he doesn't get his **** together my husband will kick him out and I don't want that.

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