Abstract: This study investigated the relationship between the dimensions of siblings abuse and the personality development of children. Relevant literatures were reviewed for the study. To guide the study, three research questions and three hypotheses were developed. These were used to measure the main variables of the study. The target population for this study were all families in Abraka, Delta State. A sample of 380 respondents was randomly selected for the study: It comprised staff and students in the university in Abraka and students of primary and secondary schools in Abraka community. The instrument for the study was a questionnaire titled Dimensions of Sibling Abuse and Personality Development Scale. To analyse the data generated, the t-test and multiple regression statistics were used. The analysis of data revealed that siblings predispose young people to dysfunctional personality development. It also revealed a significant difference between dimensions of sibling abuse and the gender of the respondents. The conclusion drawn from this study therefore was that sibling abuse irrespective of its dimensions has a negative impact on the victims of such abuse. The effects are noticed in their emotional, psychological and physical development of children that are abused. The study therefore recommends that structures should be put on ground to check this ugly phenomenon that is gradually destroying the personalities of young children. This can be done through effective counselling for family members, rehabilitation for abusive parents and penalty to be imposed on anyone who indulges in this behaviour.