Hi JB, Welcome back to the forum mate.
Sorry to hear this – your head must be mashed my friend.
All I can say is that you cant control people mate. Although it is your dad, only he can decide what decisions he wants to make and all you can do is support him in whatever way you can. If you try to force him to stop drinking, then it will just cause arguments between you and you dont want to spend what could be his last couple of months arguing; might as well try and spend some quality time with him rather than trying to change his ways.
Don’t feel guilty over the situation – there really is nothing you can do. Just remember the good times you have had with him and try and get a few more decent memories over the near future.
Always here if you need to chat mate.
Andy