Caporegime
It said "I don't know who your wife is, to whom shall I send this message?"
But it didn't remember, I got the same prompt when I tried another text.
/edit - Oh very clever, I just said to Siri "My wife is Mrs. Feek".
"Do you want me to remember that Mrs. Feek is your wife?"
"Yes"
*sorted*
Clever Siri