Ch 1: An angsty toddler

Mikoto stared at Fugaku. Her husband stared back. There was a deafening silence before it was broken.

"Oh dear." Fugaku murmured in rising horror.

Mikoto kept her facial expressions blank. "Oh dear doesn't cover the half of it my love."

Or: A child was born into the Uchiha family five years before Itachi. This is quite possibly the worst thing to happen to the Clan since Madara.