Sorry to hear this Barbara. You're right not to interrupt the children's (I assume we are talking 30s or 40s) holiday. There is nothing anyone can do, so the living should get on with their lives.
Coming to terms with his imminent death is just not something us humans had to do before medical science helped us live so long.
These next few months will be tough. Please remember to set aside some time for yourself. I don't know if you have some hobby you can do once a week ideally with other people, but even working in the garden for an hour could be good.