How Big Will My Cat Be?

So right now I have a 12 week old, 5 (almost 6) pound kitten. He is not fat.
I was thinking he MIGHT be a bigger cat.

His mother was a Persian/Ragdoll/Siamese and the father is unknown. He is, however a lynx point/tabby point.

He is the kitten in my profile picture.

I just want to know how big he will probably get.

He might end up as big as my cat, who was about the same size at that age. He weights 14 1/2 pounds today.