No they are not. Haylie was born on February 19, 1985 while Hilary was born on September 28, 1987.
There r both sisters duhh
No, they're just sisters.
Yes, haylie being the eldest who both sings and acts.
No she doesn't. On the Lizie Mcguire movie the person who plays Isabella was Hilary Duff too it's just a computer they make Lizie head appear and someone's elses body.