How to tell my sister?

I get a call from a hospital that my mother is in critical.condition, I am aftaid of losing her!!:( I already lost my father I dont want to lose her too, whats worse is that the reason shes in this state is because her idiot husband wouldnt let her see us so they got in a car to drive to church to un sin her and on the way they get in a car accident, the guy dies, my mom barely hangs on. How do I tell my sister? HOW!?! Shes gone througn enough, I feel telling her this is just going to.make her depressed! She hated.that bastard for his aggressive ways to.make her read the bible, what will she think now knowing its his.fault our mother can barely.hang.on??:'( HELP!!!!