Small medium big

Natalie is now the proud owner of two Elmos. One is small. One is big.

If we add in cousin Nicholas, then Elmo is small and medium, while Nichy is big.

If we add in Natalie, the Elmos are tiny and small, Nicholas is medium, and Natalie is big (and so are her teeth).

Add in me and the Elmos are teeny and tiny, Nichy is small, Natalie is medium, and I'm a giant.