Siri problems with my new 4s!

It doesn't seem to like me very much. I keep telling it who my brother and dad are, and it is reluctant to remember.

Me: Ahmed is my brother
Siri: Do you want me to remember that Ahmed is your brother?
Me: Yes
Siri: Okay, I will remember it.

then...

Me: Call my brother
Siri: Who is your brother?

Imagine this for 2 hours! The only person it remembered is my wife, which is weird. Any suggestions? I'm trying to get through to Apple Care but no one seems to be available to help!
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iphone 5|iphone 5 release