My son and I share my phone. Well I can not access my account through google as it automatically signs him back in
I'm trying to access my account, but it will not give any options to switch accounts on Google. It just automatically signs my son in.
Try starting up the Pokemon Go ap while on Flight modus. After a short while there will be a button that you can change/sign in with another account. Ofcourse, don't forget to shut the flight mode off after that.