Lord_Dark_Cloud,
Some firmware on some routers will have issues with forwarding what it sees as the same ports (eventhough they will be different protocols) to the same PC on two seperate lines.
Having said that, you shouldn't have to forward anything on your router in order to LAN-play with your wife.
Did you both check the "LAN" check-mark in the upper-right of the "multiplayer lobby"?
Then in the "Sever/Host" line put the local IP address of your wife's (the host) computer. ie. 192.168.xxx.xxx
That should do it, if you're still having issues I'll get ya on my TS again and we'll figure it out!

the Monk