The Unfair grandma

My Grandmas name is Bob,
She dislikes me and my mom,
She adores my little brother,
But hates me and my mother,
It is so unfair,
I have ugly hair,
His is red and curly,
And he is so very girly,
She makes me wear poofy dresses,
And he makes messy messes,
She makes me clean them,
She is very mean then,
He wants a hen,
She gives him ten,
I want a puppy,
Not even as much as a guppy,
Did I forget to say,
That today is opposite day.