is this really the end

my dad died yesterday at 4:00am morning yesterday and since then my brother marc has been trying to decide whether to do suicide and without my brother here to comfort me i dont know what i am going to become i know i will become depressed and even be put into a mental intuishion and i really dont want that because i know for a fact that my brother will do it he has been trying to avoid everyone and has been trying to overdose because of he knows that life without dad will only cause him depression i have never seen my brother so weak he has never shown emotions so i dont know what im going to do and so i think that i am going to have to end all my life i cnt believe ive lost everyone my mom died from giving birth to me and i’ve had this guilt all through my life and i dont have a clue what to do any more i cant believe that my dad died he was only 36 he was too young to die im scared of whats going to happen with my brother acting all un happy