Sisters Ugly and Uglier

I have an Ugly sister;
I have an Uglier sister.
I won't say which is which.
Sometimes they love me like crazy,
Sometimes they ignore my existence,
Most of the I'm just they're little sister,
Who's smart but pathetic,
Who has musical talent, sense of humor,
And a lack of logical reasoning.
Ugly sister is usually my friend,
Uglier is usualy a slut.
Sometimes they switch,
Somteitmes they gang up on me,
During those times id to best to keep away ---
Their fists might make me Ugly too.
I have an Ugly sister;
I have an Uglier sister.
I won't say which is which,
But they know who they are.

*AUTHORS NOTE*
The poem itself is stupid, but the story behind it, with all the details, is 100% true.