SOLVED. Fantasy novel, side character Riley who drives a red sports car. I believe she is a siren. The grandpartents house is old and on a hill, everyone is weary of this family.

[Dominique]

I read this book in the year 2010. I can not remember the main characters name, but one of the big side characters is a cousin named Riley who drives a red sports car, I believe she is a siren. The grandparents house is on a hill, and everyone is weary of this family. I believe there is something about all saints day involved but I could be mixing up my books. The main characters friend also has a huge crush on Riley as well. The red sports car is convertible in the book I believe.

[Dominique]

I have found the book !!! It is the Caster Chronicals

[Ky]

Beautiful Creatures, the first book of the Caster Chronicles, for the clickable link.