Papyrus of Binding

We agree that Scrooge has three genetic clones: Webby (April), May and June. Genetics made it his offspring, but then why was it Webby who discovered the papyrus? Certainly, May and June were created from Webby, not from Scrooge, but the idea that Webby is their mother... Is it because there is too much blur in May and June's blood? And then, Scrooge said his heir, right? Not his descendant/child? So why was only Webby able to find the papyrus?

Please answers!

Please note, I have not seen the Ducktales series, so some facts may be incorrect. And I use Google Translate...

What if either Glomgold, Magica, Mark Beaks, Ma Beagle or anyone else has the Papyrus of Binding?

So, basically I have a question. If Webby was the heir to Scrooge McDuck then why didn't the papyrus appear to Webby earlier in her life? Why did it appear to her, only when Bradford brought her to a specific location? Why didn't the papyrus of binding appear to her the minute she was born/created?