If you give a three year old some yarn......

she'll most certainly want a little brother to tie up...

Her little brother will remind her of messes, so she'll quickly begin to make one for herself.

After she sees the glorious mess she has made, the hodge podge of string everywhere will make her think of a nest, so she'll ask you to tie the string up in the chair so that she can be a bird.

You'll tie the string up, but there will be one little strand hanging off the edge. Your three year old will certainly see this and think of a tight rope. She quickly ask for help in stringing it from one chair to another.

After many failed attempts at tight rope walking the yarn, her concentration will break and she'll see that the strung up string looks quite a bite like a jump rope. She'll immediately give up the tight rope idea, and begin to jump back and fourth across the rope.

All this jumping will remind here again of her brother again, so she'll dash out of the room to look for him.

Now your three year old will jump to her hearts delight, until she goes back into the living room and sees the mess of string. Once she has seen that the string is still out, she call for her little brother to tie him up....