Baby Tooth/Jack theory Rise of the Guardians

What if, under the tooth fairy "uniform", Baby Tooth has an uncanny resemblance to Jack's sister?
Just a thought~ I've been stuck wondering about what the tooth fairies look under the uniform, and the theory that Baby Tooth shares similar birthmarks with Jack's sister and how close Baby tooth and Jack is...

Of course, all rights to Rise of the Guardians belongs to the wonderful people at Dreamworks and William Joyce