LAUSR

The detrimental effects of parental break-up on children's mental health are well-documented. However, research has also shown that children living in joint physical custody (JPC) arrangements often fare better than children living in sole physical custody (SPC) arrangements. Thus, the question arises: What are the differences between JPC and SPC that account for those results? Drawing on data from the Family Models in Germany (FAMOD) study conducted in 2019, structural equation models (SEM) were estimated to deduct the mediating role of coparenting support in children's mental health in 465 JPC and 652 SPC families with children aged 2-14. The findings suggest that the better mental health observed among children in JPC families than among children in SPC families was fully mediated by coparenting support. However, this held true only for internalizing and externalizing behavior, but not for prosocial behavior as no differences between JPC and SPC were found for this dimension. The findings affirm the importance of supportive coparenting for children's well-being after family dissolution in both SPC and JPC arrangements. After breaking up, parents should be supported in their parental engagement through coparenting counseling or psychoeducation classes.