The study – published in the journal Psychological Science – found that the likelihood of divorce in children who were adopted more closely reflected the experience of their biological parents, rather than their adopted ones.
“Across a series of designs using Swedish national registry data, we found consistent evidence that genetic factors primarily explained the intergenerational transmission of divorce," the study’s first author, Jessica Salvatore, said.
Co-author, Kenneth S. Kendler, says it's a significant finding.
“Nearly all the prior literature emphasised that divorce was transmitted across generations psychologically. Our results contradict that, suggesting that genetic factors are more important.”
Salvatore believes that these results will help therapists identify more appropriate issues when counselling couples.
“At present, the bulk of evidence on why divorce runs in families points to the idea that growing up with divorced parents weakens your commitment to and the interpersonal skills needed for marriage,” Salvatore said. “So, if a distressed couple shows up in a therapist's office and finds, as part of learning about the partners’ family histories, that one partner comes from a divorced family, then the therapist may make boosting commitment or strengthening interpersonal skills a focus of their clinical efforts.”