So I have a slight dilemma, I am going to have 2 little girls, which means I need "Big Sister/ Little Sister" T-shirts. However I don't want them to just say big sister and little sister, I want them to be humorous. So I need some ideas, cause the ones I'm coming up with are kinda lame ie:

Boss
Grunt

Why?
Because?

I'm the smart one.
That's what she thinks.

You may be the princess, but I'm the queen ~The Big Sister
You may be the queen, but I rule the throne ~The Little Sister