Money and the meaning of life help?

My mom and dad works hard their entire life saving enough money to buy a house in San Francisco and they also have another house here too so it's a total of 2 houses. My parents also have another house which they spent lots of money in Asia for constructing it, but we don't go there that much and probably going to sell it someday. I have a brother who is quite fat that you can see vein lines on his stomach. I on the other hand, my doctor told me I will get cancer someday. So both of us aren't very healthy. I am so depressed about life it's so sad when you see someone dying and you have money left not spent. Since I know I am going to die from cancer someday not sure when. I am 24 years old almost. I don't plan on marrying a guy, because all I know is that they'll get all my money when I die from cancer someday. I know most guys will hookup/marry again after their wife dies and likely spend my money on her. Although, I can always make a will and transfer the money to my brother. If someday I do die early from cancer and possibly get married before I die from it, do you think it's equally fair to make a will saying that I want to transfer my money to my brother and my child if I have any and not to my husband. I have an evil thinking haha. Anyways, we all know money makes the world go round and without it we cannot survive. What do you think I should do?