What is there to say ?

what are you supposed to say to someone who just lost their mom.  My aunt died and I have to go to the viewing obviously, but what am I supposed to say to someone who just lost their mom. I love my cousins, But I don't see them as much anymore. I'm just in so much shock, I can't believe she's gone.... She had an aneurism, it was so sudden. I just hope my uncle and cousins are ok. Otherwise I don't know what to say.