Hi Clover, i don’t think that there is a strong genetic link or so my sister and i were told but in time we will all know more, maybe there will be triggers that we can avoid, try to keep your immune system strong and stress levels down and enjoy your life please don’t dwell on it, i so hope that your Dad is doing ok at the moment, and hope that Christmas will be good, we must all enjoy our loved ones in the here and now, don’t let this illness steal the better times with your Dad, and he will feel better if you are coping, i have found strength that i never thought that i could muster and i am sure that you will too, talk to your close friends they will be there for you, love San xxx