Hello Deacaighoon66
If one purchases the Swiss Half Cards (attention, it is not a pass), then the other cannot access the Swiss Half Fare Cards unless you send them the QR code or PDF ticket to be stored on their phone.
If everyone wants to display the Swiss Half Fare Card on their phone in the SBB Mobile app, everyone needs their own account and everyone has to purchase the Swiss Half Fare Card through their own account.
In both cases, all must carry their physical passport with them at all times while they are using e-tickets.
Kind regards,
Roland