The Tapestry is how prophets and seers refer to time. It looks like a giant glowing tangled knot with light-like threads constantly changing, tangling, and altering paths.
It’s nearly impossible to predict with 100% accuracy.
There is a reason Myrddin. Katie Lin's uncle, and one of the most important members of the People of the Kin. Being Kin is always a crapshoot; there's really no way to predict what any particular combination will create, and Merlin is no exception. His particular ancestry is unknown. He's Asian - possibly ancient Chinese - and thousands of years old. He's also the... refers to fortune-telling as “very good guessing.”