And yes, I would recommend talking to anyone whom you trust and feel would be helpful in this situation with your husband. If you father in law is close to you, and knows the journey, signs, symptoms and struggles of negative relationships with alcohol, he may very well be a true source of help and support.
But ultimately, it has to feel right to you. All of your choices have to feel right to you. And no one can tell what to choose, sadly. I think it is a "code of conduct" around these here parts!
good luck...