I'm so sorry your going through this.
It's a really difficult thing when they tell someone a prognosis, because you almost start watching the clock. Prognoses can be really difficult to get right and anything can change during palliative care as generally scans stop and it's a waiting game to see what happens.
If the hospice have his symptoms under control, then that is a good thing. As things progress, he may stop eating / drinking completely (this is distressing, but normal in end of life care).
Some things to think about - does he want to be at home when he dies? If so, make sure that the team who will be coming in daily to support with symptom management (like a syringe pump) know about him - that might be the hospice team, but it may also be the district nurses, and it's often a whole lot easier if you know who they are and how to contact them urgently if you are concerned. (I apologise if that sounds harsh or heartless, it's not meant to be at all)
IMO, it almost better if all the professionals who might need to be involved are aware sooner rather than later, because then you can get things in place (like injectable medicine, written up and in the house in case he needs it - that is much easier to sort during the week on a just in case basis than at 3am on a Sunday morning).
Other things to think about or ask he hospice about if they haven't yet is things like equipment - pressure relief for his bed, sheets to help him move in bed for example. These will make things easier.and more comfortable as time goes on.
I'm sending you strength. I am always in awe of the strength families have in these situations.
Finally, there is absolutely no such thing as a silly question - ask the professionals involved if there is anything you need or want to know. No one will mind giving you the time to answer questions, support you or put your mind at ease.
