Ask two people for password recovery

I want to split database access and permissions with another person. The problem is we don't know how we can make sure we both have the same rights and permissions to operate the database. So if anything goes wrong for example, one wants to change the password of the database or the email the other should confirm that too and should be informed.

Or any possible option for us to have the same rights 50-50...

The website will be for making money we invest in that website 50-50 so thats why we want to make this also...