Ocarinak
It's "Tael".
No one can really answer that question without knowing the mysteries of Time. Why does Link not lose Tatl if he loses all of his disposable items? Why doesn't Link lose his mask? Why wasn't Tael taken with them? I don't know. None of us do.
He doesn't lose Tatl for a simple reason, they go back in time to the begining of the 3 days. At that exact time Tatl was with Link and the mask sales man whereas the skull kid and Tael had runaway. The only 3 people who remember what happened when he does go back are Link, Tatl and the mask salesman, therefore Tael wouldn't remember how mean Skullkid was to him ontop of the tower so would want to stay with him for those 3 days. (Again...) He doesn't lose all his disposable items because
he never got them in the first place. I guess the masks stay with you because each mask is a part of someone's soul and is forever linked to Link or sometihng like that. That's the only thing that doesn't make sence. The fact he keeps the masks and the hearts. And that whole bank thing is a tad confussing...
I dunno. :^)