How Many Sisters in a Happy Family?

How many siblings do you have? Perhaps just one sister? If that's the case, did you have a happy family life?

Family Tree by zukzuk

Apparently, a popular U.K. parenting site (Bounty.com) did a study surveying over 2,000 families with different combinations of siblings and made a list of the "Best to Worst Combinations of Kids" for a harmonious family life (via one of my fav websites, the Body Odd, click to read the original article :)
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