Siri...ously...

Some thoughts on the Siri assistant on my iPhone 4S.

Me: Call my wife.
Siri: Sorry, I don't know who your wife is. I need a name or a phone number.
Me: My wife is Melissa Hunt.
Siri: Ok.  Do you want me to remember who your wife is?
Me: Yes.
Siri: Ok. Connecting you to your wife....

Since my wife didn't answer, I thought I'd send a text message.

Me: Send my wife a text message.
Siri: Sorry, I don't know who your wife is. I need a name or a phone number.

Siriously??? 

So, Siri remembers who my wife is if I want to call her, but not if I want to send her a text message?  What's up with that?