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A study from the University of Michigan says children living with half or step-siblings behave aggressively more often than other kids do.
The study, from U of M sociologist and lead author Paula Fomby, also shows that about one in six U.S. children live with a half or step-sibling, a larger percentage than previously thought.
Earlier studies on the subject have focused more on the parent-child relationship.
But this new research notes that most young children in complex sibling relationships live with both of their own biological parents or a single mother, instead of step-parents.
The study will be in the February issue of the journal Demography.
It looked at a sample of about 6,500 children and their families.
The research was supported by a grant from the national Science Foundation.
