Your best bet will be to get involved with PS Support. Be on the up and up with them.
If you try to hide it, they will find you, then ban you for life, and take your money. They are experts at figuring this out. They WILL find you.
Another option is different funding accounts. Do this with their knowledge.
Another option is connecting via your neighbors WiFi. While this would probably work, the problem will be that one time you forget to change to their WiFi, then end up in the same game as your wife.
Honesty will be the best when dealing with support. It may be that they can fix the problem for you, happily.
I have NO EXPERIENCE doing this, but I have been here long enough to have seen many thread like this. There have been times, with other rooms, where for whatever reason, I ended up with multiple accounts. Usually thru mergers. In at least 1 case I didn't even know I had a 2nd account at the site, till something odd happened that reminded me. I got a hold of support and the issue was cleared easily.
What they don't want is one person having multiple accounts. And they know how to ferret you out.