Of course, you can use multiple linear regression. The results will show which variables have a stronger effect on your dependent variable after controlling for childhood trauma. Considering mediation analysis and attachment styles research, I can suggest that you should consider whether you measure the two dimensions of the attachment scale of romantic relationships or attachment styles as a classification. The second one is whether your sample is clinical or healthy. In this case, if you had not preregistered your study, you can try to analyze the effect of attachment styles or dimensions on personality via childhood trauma after controlling for family functioning. You can use JASP, adding attachment dimensions as independent variables, personality as the dependent variable, and childhood trauma as the mediator, with family functioning as a background confounder. At first, you can use it without a background confounder, and in the second model, you can use it with a background confounder. But I think if you had used romantic attachment styles, attachment styles could be independent variable, family functioning as the mediator, personality as the dependent variable, and childhood trauma as a moderator

Best regards,

Thank you so much Dr. Ecer

Your answer was very insightful and I will consider your suggestions

Thanks for the reply