wow, sounds like your family is having some hard times... I can cope with your sister, I had Hodgkin's, which is a kind of lymphoma, though it is apparently easier to treat than non-Hodgkin's lymphoma. It's gonna be tough time but with luck and optimism you'll get through. And remember, in some countries, doctors actually prescribe weed for people with cancer and undergoing chemotherapy, so it can't be that bad for you, can it?

Good luck buddy, hope everything ends up all right for you and yours!