Certainly, people can get along without siblings. Single children do, and there are people who have irreparably estranged relationships with their siblings who live full and satisfying lives, but to have siblings and not make the most of that resource is squandering one of the greatest interpersonal resources you'll ever have.
Sentiment: NEGATIVE
I've always had this interest in sibling relationships because I don't have any siblings. I'm completely a product of the one-child policy in China, so I always kind of wished that I had an older brother or a younger brother or sister just to have that bond, so I find myself constantly writing about that relationship.