When my brother was spending a lot of time in the hospital, I loaned him an iPad.  I deleted its "memory", set up his google email account on it for him, set up his Facebook etc., and just did what ever he needed me to do to make the device function for him. After he passed that iPad set unused for sometime before we wanted to use it again. I can't remember now if I forgot the password or what, but it took some effort to unlock the device. Apple was helpful and I did have to provide collaborating info to back up what had happen to make a device I owned "come on" for me. For one thing, I had "wiped" its memory again. Tedious story shorter - the google account on this blog somehow became associated with his name, my maiden name. I recently noticed that his name showed up as sender of emails sent from my google account. This is like two years later - so idk. Anyway, one of my kids wanted to use my laptop to sign in to their google account so they could send an email and I said, sure.
When I tried to sign back in - I can sign in to my google account but not his - and his is they one blogger thinks the account belongs to. My blog account.
I don't know how to solve this problem.
My phone is still signed in. That's how I'm noting this now. But I don't like to type blog stuff  from my phone.