“…Yet it would seem that the quality of the relationship between siblings, as revealed by a careful dynamic study of each case, is more telling than coefficients of correlation obtained on large groups superficially studied. In this connection, it is worth recalling that in the early psychoanalytic studies by Alexander, 2 ' 3 Van der Heide, 121 Levey, 83 and Wilson, 128 the importance of sibling rivalry is clearly described even though in the final theoretical discussion these factors seem inadequately emphasized.…”