This is more about curiosity as I didn't initially view my kitten as being pedigree..
My friend 'rescued' two sister kittens from a place that bred Persians (they are legit , registered breeders). They were unwanted due to their pure persian mother having somehow got pregnant with a moggy. They were unhappy little things and my friend couldn't bear to leave them(she was on holiday and came across them quite by accident really) so she bought them off the breeder who basically wanted nothing to do with cats that weren't pure :-(
Anyway..these two half breed kittens grew up to be beautiful girls... (but v timid and not at all socialised, due to their bad start)One of them looks 100% persian...the other I'd say about 70% in looks.
About a year and a half later my friend let them have kittens of their own. They had them three weeks apart and with moggie fathers (true identity not proved but we have good hunches i.e. toms that were letting themselves into her house/ garden)
I have a now 4month old kitten from the mother that is slightly less persian looking than her sister. He looked entirely moggie when tiny and is now a little more persian looking but not as much as his mother (I'll post photo of him) e.g. he doesn't have the very rounded, pug like face like his aunt but he has the eyes and more delicate, feminine features of his mother
To me he's just mainly moggie with a dash of persian... a quarter persian? though the persian side seems to be emerging more and more and face gone from v pointy to more rounder (unless it's winter coat coming through)
but someone recently told me that if the matriarchal line is pure persian (which it is) then that makes him persian too. How?