My younger bro (he's 22, I'm 26) were discussing sibling relationships last night. When we were growing up, we fought like cats and dogs, but in recent years we get along great...go out for dinner, cover for each other with mom and dad, etc etc., even though we're as different as night and day. He thinks that we're a rarity - that the number of people who do NOT get along with their siblings far outnumber those who do. Is this true???