My father-in-law is dying. How to help my husband?

My father-in-law was diagnosed with bone cancer a month ago. They put him on hospice care because the doctor said that the extent of the cancer left no treatment options. My husband was obviously upset. He cried quite a bit that night. Last night, the nurse came to check on him because my mother-in-law said that he had developed the "death rattle." The nurse ended up telling us that he had 24-36 hours left. My MIL and SIL started crying upon hearing this. However, my husband did not. He acted as though he was not upset. Later on, when everyone was going to bed, he was standing beside his dad's bed crying. I am worried that he is concerned about being strong for his family and maybe even being embarrassed by crying. I don't want him to bottle it up. I know that everyone deals with pain and death of loved ones in very different ways, but is there anything that I can do to help him? My MIL and SIL keep asking him if he is okay and he seems to get very irritated by it. I haven't asked him about it and have left him alone until now. I am just worried. Should I just continue to leave it alone? The nurse advised us all to say our goodbye's last night and all of us except him did so. He would not do it. Is that a bad thing? I would appreciate anyone who has dealt with this type of situation before to reply. My grandmother had lung cancer and was put on hospice care, so I know the feeling. But I am a "crier" and cried all the time. I guess that it might just be that I am not used to seeing someone react that way to this type of situation.