What is correct? We are a family of four: my father, my mother, my brother and me. or We are a family of four: my father, my mother, my brother and I. or We are a family of four: my father, my mother, my brother and myself.
All are correct—they differ only in style. The choice of I or me usually depends on whether the pronoun in question is part of the subject or object of a verb. In this case, the verb is to be. Here’s a simple example:
It is I.
It is me.
Using I sounds perhaps more formal, but also less natural, so use me if you’re writing as you would speak. Myself is normally used with a reflexive verb, where the object of the action is also the subject:
I take care of myself.
However, myself/yourself/&c. are also frequently used as more formal alternatives to me/you/&c., especially in lists of people. Some object to it as a matter of style, but I think it’s also acceptable. When in doubt, choose me:
We are a family of four: my father, my mother, my brother, and me.