Help! what,when,how to talk to a spouse who is notgoing to recover from advanced cancer?

Can anybody help or advise me?My husband of 40+ years has terminal cancer and our daughter is so angry with me as she says I am not being up front with him about the fact that he isn't going to recover!I am caring for him at home with some much appreciated help from various sources(not from our McMillan nurse!)I am in a wheelchair so at times it is very difficult but I love Tony(my husband)so much that I am prepared to do all in my power to help him.He was put on a syringe driver on Saturday which is helping his pain but he is so sleepy so trying to have a 'talk' is so difficult but I wouldn't want to do anything wrong on his final journey!At times he says about getting another car later this year,next he says he won't be driving again!I am sure he knows he is not going to recover and is just trying to spare us as we are trying to keep'up' for him!I'm so confused about everything.Anyone out there who can help?