Just found out my grandma has cancer!?

i just found out my grandma has cancer about 2 days ago. so did my whole family. i dont know what to thik about it. i have abig family and we never really had a devastation like this in a LONG time, other then pets diying, i havent had anyone so close to me die. i have no idea how bad it is or anything but my dad has been more down lately and im upset. and im going to sleepaway camp in a month and i dont want anything to happen that will upset my and my trip and i just know ill be worrying about her for that time and i dont want it to get in the way of my finals or anything. im just lost right now and i dont know what to do!