I wonder why there is the honorific plural here.
चाची could only be honoured from Peter's view, but Peter is not speaking here.
Or does alone the fact of being an aunt justify to be honoured?
If someone is elder in age they are honoured with a plural like this. Again, if you are talking about or with someone you do not know much about ,then , plurals are used, they are also used while talking formally to someone.
Why didn't they accept "Peter's aunt is asleep."...?
I think that would be, "Peter ki chachi soi hui hai."
That explains.. Thank you:)