Helen L. Koch, The Relation of Certain Formal Attributes of Siblings to Attitudes Held toward Each Other and toward Their Parents, Monographs of the Society for Research in Child Development, Vol. 25, No. 4, The Relation of Certain Formal Attributes of Siblings to Attitudes Held toward Each Other and toward Their Parents (1960), pp. 1+3+5-7+9-33+35-69+71-97+99-117+119+121-124
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Helen L. Koch (1960) studied this question.