How can I read my wife’s WhatsApp from my phone? – On your PC, use Whatsapp web.
Log into her Whatsapp online account….you’ll be able to read each message that enters her account on her cell device there.
This will only work if you have one-time physical access to your wife’s phone and can read her texts, or if her account has been used on your device and she has not cleared user data.
Aside from that, your best bet for reading her WhatsApp from your phone would be to seek the assistance of a professional/expert hacker, as you’ll be assured solid feedback in a matter of minutes.