My text messages are received by my wife's iPhone and iPad My wife receives my SMS text messages on her iPhone and iPad. How can I change this?

I do not get her messages on my device
If you're sharing an AppleID for iMessage this is expected behavior.  You can also double check to make sure you don't have any conflicting settings.

From iMessage settings, verify Text Message Forwarding:

Navigate to Settings (app) > iMessage > Text Message Forwarding

Then verify your send and receive addresses:

Navigate to Settings (app) > iMessage > Send &amp; Receive

Those are the 3 pieces that would be causing an issue on your end.