Audi

I have two last names, where I am from that how it is... let me explain I have my name, my mother‘s last name and then my father’s last name but here in America the only one that shows is my father’s…and he never been a father to began with(I do love him, but I know he is not a good father at all) the way I look it is why should I carry his name when the one that only/always been there is my mother. So to honor her I like to change my last name to her...is that crazy??