While it should come as no surprise that psychological, social and academic functioning are impacted negatively by children raised in family chaos, or in situations of profound change and stress, Dr. Kathryn Harker Tillman from Florida State University reports that, on average, adolescents living with half- or step-siblings have lower grades and more school-related behavior problems, and these problems may not improve over time.
"These findings imply that family formation patterns that bring together children who have different sets of biological parents may not be in the best interests of the children involved. Yet half of all American step-families include children from previous relationships of both partners, and the majority of parents in step-families go on to have additional children together. ("Non-traditional" Siblngs and the Academic Outcomes of Adolescents,
Social Science Research, 37(1)