I have 2 of my own accounts. One I write on and the other is my sisters old account that she said I can check my stories work correctly. (I only use on my iPad) The third I share with my friend so we can write a story together. The account with my friend I log in with Facebook because I don’t use Facebook so it’s easier.
My account I write on, I login with Google but I logged out to work on the joint account. When I tried to log in using Google again I accidentally used my sisters Google account and now I can only login to my sisters old account and the joint account. 
is there any way to fix this? I’d be very grateful if anyone can help me out.
