Hi there and welcome
Are you accessing the gmail account via your web browser Bonnie?
When you are in the account, click on the circle in the top right and select Sign Out
This signs you out.
Then you can sign in using the correct account for your parents.
I can also do these steps for you, and have made a request via Additional Services. This is optional, and if you choose to do this, I can, with your permission, remote into your computer while you watch and do all these steps (and deal with any problems that arise during them) for you. Or if you do not choose to take this service, we can continue here. This is no problem at all. Just let me know please.
Else let me know the results please