you are not and never could be second rate.
you and Squeakie are different, but both of you are perfect in every way.
Baby sister does need you, you have helped her to become stronger and have offered guidance and support to her all her life. (except for when you teased her when she was tiny because you thought she sounded 'funny' when she cried...)
she looks up to you and learns so much from you. i love the fact that you two are so close and best friends. you are so lucky to have eachother.
you and your sister may seem to you to be different, but together you are a formidable force of nature.