设抛物线为y=a(x﹣1)2+1,
∵抛物线经过点(2,3),
∴3=a(2﹣1)2+1,
解得:a=2.
∴y=2(x﹣1)2+1=2x2﹣4x+3
(Ⅰ)A1C∥平面BDE;
(Ⅱ)平面A1AC⊥平面BDE.