I think a sibling relationship is typically one-third teasing, one-third fighting, and one-third loving. With me and my brother it was 80 percent teasing, 20 percent fighting. I don't take well to being teased now. I became a 10-year-old girl Don Rickles in order to deflect my older brother's remarks. Attractive! Having never received it, I tend to lack empathy for the people I tease, and often appear heartless. Then T gives me the hurt puppy-dog face, that i've stepped on his tail, and I'm like, uh-oh, what did I do now? My short answer, therefore, is that teasing must be accompanied by empathy, forthwith! (like that!)