The more siblings you have, the lower your chances of divorce. Sibs improve social skills, or is it something else? http://ow.ly/Fm85n
@JayMan471 I am not talking about number of siblings, but effects of the other sibling's personality, crime, interests etc. on each other.
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@KirkegaardEmil That would still show up as a C effect - making sibs more similar than they would be from A+D alone. -
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