Hello, Diva, and welcome to the forum. I'm very sorry about your FIL's condition. There is really a lot of missing information. For example, was he doing just fine until 2 mos. ago? What caused the cirrhosis? I have a feeling it may have been from alcohol, since you didn't mention the possibility of a transplant (he would have to have 6 mos. of documented sobriety in AA or alcohol counseling to even be evaluated for transplant.) Did he receive any type of treatment for the cancer? The MELD score is just an indication of how much his liver is failing. It's primary purpose is for transplant.
I agree with David about adding Xifaxan to the Lactulose. Hospice specializes in keeping patients pain free, so you needn't worry about that. They are most excellent at what they do and I'm glad to hear that they will be involved.
There is really nothing more I can tell you. Some patients hang on for months and even years, while others go quickly. As we always remind caregivers and family, remember to take care of YOU.