Why hasn't JK Rowling sued Rick Riordan yet?

because there would be no case r.r. based on mythology and j.k. based on fantisy ---------------------

i know there are some similartys to the lighning theif and the Harry Potter books but i say that its not the same

luke-died drako-lived

harry potter-hit by the killing curce 2 times percy jackson-whats the killing curce

hermine----fell in love with ron annabeth-fell in love with percy

ron-eats anything grover-vegitarian

kronus- evil truble maker voldemore- hitler like guy, is like a tenage girl if you look at it .

and the diffrences contenue