Board Thread:Rebirth: Applications/@comment-26116209-20141012170700/@comment-26116209-20141030220039

When the family went to Konoha, they were still young. Shai was the one who asked to visit Konoha for his birthday. The eldest child still didn't know how to properly activate her Sharingan, which resulted in it awakening when the Nine Tails attacked (which means it activated in emergencies).