"Think of it as a new game." Zac - the real Zac - suggested. "Who is really Zac?"
"It won't be that hard Zac, or Ike, whoever you are." Taylor replied. "You're one of a kind."
The Zac's grinned.
"Ahh, but you're forgetting that Ike has been around Zac all his life." Isaac said.
"Yeah, how do you know that Ike can't do a damn good imitation of Zac?"
It was Taylor's turn to grin.
"Well, for starters, Ike is telepathic, so..." Taylor began *if I send a telepathic joke, only Ike will hear it... MMMBOP!*
"Yeah, but Ike can block you from sending him messages Tay." Zac pointed out.
"So Ike doesn't have to listen to you!" Isaac laughed.
"Point taken. Ahh, well, let me see, what's a question Zac can answer and Ike can't..."
"This oughta be rich." Isaac grinned.
"Very rich indeed." Zac replied.
"Oh, ok, so I can think of anything. I do have one final method."
A knowing smile came on his face. He pointed at Isaac.
"You're Ike. I know you're Ike because you have Ike's persona and it's different (although only slightly) from Zac's."
"And we know you know that how?" Zac asked.
"What would you do if you were wrong Tay?" Isaac smiled.
"Ahh, but I know I'm right now because you guys have an 'oh damn, caught' feeling emanating from you."
Isaac and Zac looked at each other.
"Yeah, ok, next time we don't pull this prank on an empath." Isaac said, changing shape again.
"What on earth... oh my gosh, Ike! That's scary. Don't turn into Jess!"
Zac and Taylor laughed.
"Oh? Why not?" Isaac asked in their sister's voice. "I think I do a great Jess. Oh wow, think of all the impersonations I could do now!"
And so, Isaac entertained his brothers with full on impersonations of everyone from Marilyn Monroe, to Austin Powers to Freakazoid. Now that was scary.