I think that is perfectly reasonable actually.
Ww had some friends to dinner yesterday and I phoned them at 8.30am to check what they didn't eat before I went of to the supermarket to buy ingredients. I assumed as they had a three year old at least one of them would be up.
The phone was answered by their 7 year old, who said:
Hello, XXX speaking, who is this please?
I said: Hello it's Hilly here, can I speak to mummy please?
There followed a long pause, and then he returned to say:
She is here, but she is still asleep and I really don't want to wake her. I think you should call back later.'
I thought what a damned sensible and efficient child. He'll make someone an excellent PA one day. 