“…It is typically accepted that adoptive parents often have low rates of psychopathology and a higher socioeconomic status (Beckwith et al, 1999, Belsky et al, 1996, Weinfield et al, 2000. It is possible that our sample is not representative of the general population thereby inflating stability of attachment and adult sibling concordance (Allen, McElhaney, Kuperminc, & Jodl, 2004;Bar-Haim, Sutton, Fox, & Marvin, 2000;Belsky & Fearon, 2002;Hamilton, 2000;Lewis, Feiring, & Rosenthal, 2000;Sroufe, 2005;Waters et al, 2000;Weinfield, Whaley, & Egeland, 2004). The distribution of primary attachment classifications differed significantly from what would be expected from estimates derived from meta-analyses.…”