So a UK study concludes that only-children are happier than those with siblings. But what constitutes being happy? It is a very subjective word, and if it is characterized (as in the quoted survey questions) as the absence of competition within the family, or adversity, then yeah, I might buy that. But are those the only things that constitute happiness? Are those even the notions of happiness that will ever matter to us in the real world? Hah!