This may not be possible unless you used grip and trigger, trigger being left and grip being right. Cause the oculus quest 2 only has 3 trackings, one for the thumb, one for the index, and one for your whole bottom of the hand since grip is your midd...

You can use the Oculus App to cast your headset to your wife, it's not a complicated process at all. Just download the app, log in with your facebook account, then press the controller with the waves coming out at the top right. Press Quest 2 and onc...

If anything, the parents can make a facebook account for them and log in to the headset like that.