Cell phone WiFi

[king1]

you may have setup your phone using your wifes google account, would explain why you see her contacts.

Likelihood is yes it will delete from her contacts as the contacts sync across the google account


What you probably want to do is create your own google account, add that to the phone then remove your wifes google account. Some instructions for doing that are here albeit looks to be for an older version of android
https://inspecttrack.com/help/how-to-cha...n-android/