There is a branch of the family tree that is firm and adamant: FAMILY is FAMILY.
It's not that these indomitable siblings happen to get along; they make a vehement point to get along. This fierce connection extends to those who marry in; they may not like you, but they will accept you, fight for you, and actively cherish you.
When I was little, we were not allowed to fight. There was no "kids will be kids" or "work it out amongst yourselves." (I'm not saying we didn't fight, but it was done quietly and out of parental earshot.) In fourth grade I came home with the idea of "donkey ears"—I actually had no idea what it meant—and how Ta screamed at me after I performed it on an unwitting Luke . . . hoo.
"Your own flesh and blood," Ma would emphasize. "Your own flesh and blood."
I'm not saying that there isn't tension and disagreement from time to time. But family is family.
I'm saddened when I hear tales of rifts between adult siblings. I understand how hurts from childhood can have such long holds (I'm a recovering grudge-aholic, after all), but childhood hurts require adult reactions, not childhood regression.
Ellen Umansky ("The Secret of Sibling Success") initially believed it was her parents' divorce that cemented the bond with her brothers. Then she wasn't so sure.
A few months ago, I was at a child’s party, and a mother there was lamenting how her young daughters didn’t get along. “It’s a parenting fail,” she said.
I thought of telling the same divorce joke my brother had made, but I didn’t. I wish I had said what I truly believed, that these things can’t be forced. The best you can do is step back and let alchemy take over.
No, parents cannot force children to get along, as "liking" someone cannot be dictated. But certain behaviors can be verboten—like painful teasing—which could make it more likely that less grudges will poisonously linger into the future.
There is a difference between close siblings and civil siblings, but civility is a lot better than active warfare. Shooting for that should be enough.