This might get more replies in the training sub board.
so long as you both have your own Zwift accounts I do not think you will have problems with the sensors or software. You may have problems with setting the pressure of the wheel every time. So you will need an easily accessible pump to get a constant pressure.
If you and your son are similar height could you buy a cheap steel frame and put it on the turbo, even if you have to adjust the saddle? This would be much easier than changing bikes.
I find that turbo usage is about making it easy to use with no temptation to not use it. But then I accept that I lack moral fibre!
thay was my suggestion .... get a cheapish bike for Zwift (even if it's a Halfords Carrera), add a decent saddle, and mark the post with tape for both riders ao it's easy to set up... and add a decent saddle such as a Brooks C17 Cambium carved (we both get on with this saddle)
My son said that it would be a hassle to set up the saddle everytime (he is a bit taller than me and has a longer torso, so his saddle is set back further. I then said no problem, we can get 2 saddle posts with 2 saddles that we can use on the one bike
My son is adamant that he wants to use his best bike for Zwift (Canyon Endurace), and I will not ride his bike, as I don't want to .... I don't want to use my Giant TCR on the trainer and would prefer a cheaper bike that we could all use (including my daughter and my wife)
I am not too knoweleagble about Zwift and the smart trainer, hence my thread, but from what I understand, if we use different bikes, we have to callibrate the unit everytime which will be a hassle
so..... the arguments have already started and we have not even got the flipping trainer yet!
I'm on the verge of telling my son that he can have the trainer for himself and when I've saved up enough, I will get my own