I surveyed my older sisters, both of whom have vivid memories of how I tripped, pummeled, and whacked them with various large plastic dolls (hey, they started it — they teased me!), and both confirmed my suspicion that nowadays they like me just fine. I sure like them. All the experts will tell you that fighting among siblings is normal. The key is how parents handle it. Rule No 1: Don’t take sides. Never get into a discussion of who started what or what is more fair. Stop fights with a time-out for all offenders. My mother would send us to separate rooms. So we invented string phones and a pulley system to transport necessary treats and toys. And whatever we were fighting about was forgotten.