My Dad has dementia. My Mom has hospice in to take care of her. Me and my sister moved out of state to take care of them. We left our family to be there. My Mom is not as bad, but Dad is always in the way and will not listen to anything. He cries all the time cause they have given Mom a time limit on her life. How do you deal with all the repeating things and childlike behavior? It is wearing us~
I would suggest you don't discuss your mom's condition with him. It would be much kinder to keep him thinking she is okay for now. As for the repeating. etc., redirect his focus to something else. Maybe there is a subject he likes to talk about. Bring it up to distract him and get his mind off of your mom. There's no fixing his condition or making him understand. I think you will find it less stressful for yourself too. Believe us all when we say no amount of patience can withstand the cruelties of dementia. You just have to "play along" and go with the situation to keep it from accelerating.
If your dad's dementia is progressing, it may be easier to distract him, but if it is just beginning, it may take some clever thinking on your part to keep him calm.
Good luck!
Hospice is for the whole family. There is a chaplain available to come and talk to Dad -- even if Dad has no religious affiliation. This person has training and experience in dealing with end-of-life issues both for the person dying and for the loved ones they are leaving.
Hospice also has social workers who can talk to you and your sister about this difficult time.
Since Dad has dementia I'm kind of sorry he was told specifically about the timeline. Waiting until Mom is in the final few days would have been soon enough, in my opinion. That can't be undone, but I definitely agree with caregiver4two not to talk about your mother's prognosis in front of him.
You and your sister are giving your parents an awesome gift.