Academic genealogy is fascinating, and it is one of the outstanding features of your site.
Unfortunately, data entry is not trivial.
I have three PhD advisers. I added one. When I tried to add the second, I got as feedback that my first edit first needed to be verified and that this would take a week on average.
I have twenty PhD advisees. I added one. When I tried to add the second, I got the same feedback.
You are Microsoft. You are smarter than this.