They definitely are not purebred Ragdolls. maybe part but hard to say. It's not a litter of Ragdolls it's a litter of pointed moggies.
Not purebred Siamese either. It can be difficult to tell a mix from a photo. & the photo of the dad is dark. They could POSSIBLY be partly old style Siamese. The photo of the sire is pretty dark. but he looks long bodied enough but heavier boned which might also mean Ragdoll x domestic .
Really they might be any mixture of moggy ( domestic / no particular breed), Ragdoll and/or old style Siamese. but not pure either of those breeds.
By buying from a BYB w/o any pedigree & registration, you just don't know what breeds they could be. background is. or if the parents are closely related for that matter. . Reputable Ragdoll breeders would not breed cats without papers, and they would do health tests on the breeding cats. (including PKD, HCM-RD & some also do HCM -MC )
Fiona is a cute lil kitten though and I hope she will have a long happy life with you. She looks too young to be separated.
If you get more cats in the future, I hope you might learn more and not support dishonest and/or ignorant substandard breeders .
I have NOTHING against responsible breeders who are preserving a breed and doing it the right way.
And I have NOTHING against pointed moggies & mixes . I have had a few absolutely wonderful ones both shorthair & longhair. But if people want mixes, I'd rather their money went to Ragdoll rescue or Siamese rescue groups which always have pointed cats of unknown ancestry. The adoption fee was about the same and they flew the cats to me, AND already neutered, up to date on shots etc.
I hope the person at least treats these pretty cats decently & doesn't breed the mama cat too often.
but it is not treating the kittens well if they let them go too young, and in these photos little Fiona does look too young to leave her mother. And the breeders i know keep them 12-16 wks. People who are mainly motivated by money will sell them younger. So be patient and understanding.