I have heard of cat's behaviors changing when their brother or sister cats pass away. I have not experienced it personally but I have read articles about it. I am sorry that Pepper is gone but I am glad Storm is turning out to be a little cuddle bug. He is probably a little confused and needs his mommy! I don't blame him.... I always call my mom up when I am sick and If I can I curl up in her lap too to get some pettin....