So...what is it?

Grandma and Grandpa came over today just as Bailey had anticipated.  They were supposed to come over on Saturday, but much to her dismay the rain kept them away (which was disappointing because it never actually rained, but we had all feared the heavy storms and those would have interfered with our plans).  But they came over today (hooray!) and made a very special delivery.  Well, Daddy and Grandpa at least left to make that part happen.  The two of them arrived back at the house with three big boxes.  Bailey had no idea what was inside and after a while of working on it, she still doesn't.  Maybe you'll figure it out.