A study I cite in this TIME magazine covering in the book "The Sibling Effect," found 70 percent of fathers and 65 percent of mothers exhibit a preference for at least one child.
Studiju koju citiram u ovom TIME časopisu  obuhvaćenu u knjizi "Učinak braće," otkriva da 70 posto očeva i 65 posto majki pokazuje preferiranje  barem jednog djeteta.