Is it just me...

or does this sound stupid to anyone else?
To preface, I don't like being bothered by phone calls and almost all phone calls bother me and I doubly don't like being bothered by my brother but
He calls me and asks me why my sister isn't answering her phone. Does this make any sense to anyone? How would I know why she isn't answering her phone. I can guess. Maybe she isn't home. Maybe she is in the shower. Maybe she is sleeping. Maybe she screened the call and didn't want to talk to you, Brother.Maybe the phone isn't working.
But really does anyone call another person at another place to ask why someone isn't answering their phone?