Ah, ok... Sounds reasonable if the kitten is acknowledged as being pet quality and is being sold as non-active.
Ragdolls can be outcrossed to both colourpoint Persians and Siamese. Going by what you say, it's entirely probable that the great grandmother is a colourpoint Persian. Easy enough to tell from the breed number on the paperwork.
The other similar type breed is a Birman. If you are buying, do insist on the paperwork though, for peace of mind if nothing else.
Yes, Torties. Poppy is like that too. And she'll biff me if she thinks I've stepped out of line.
Lexi is the cuddlebum here. She is currently sitting on my shoulder as I'm typing this.