Cant sign in anymore

I WAS HAVING CONNECTION ISSUES WITH MY MOTHERS IPAD AND SINCE I DID THE UPDATE, I CANT EVEN SIGN IN NOW!!!! IT KEEPS TELLING ME MY PASSWORD IS INCORRECT. BUT WHEN I TRY TO SIGN IN ON MY DADS IMAC IT WORKS FINE. BUT I CANNOT SIGN IN ON MY MACBOOK PRO USING SNOW LEOPARD. KEEP IN MIND, MY FATHER HAS NOT DONE THE UPDATE AND HIS FACETIME WORKS!!!!
SO DO NOT MAKE THIS UPDATE!!!!

Mar1475 about FaceTime, v1.0.4