Open adoption relationships are rife with privacy dilemmas and fuzzy boundaries, which require ongoing coordination of private disclosures as a result. The present study employed communication privacy management (CPM) theory to examine adoptive parents’ ( N = 354) private disclosures with the birth family across in-person and mediated (i.e., texting and social media) contexts. SEM analysis revealed that adoptive families who were more private and were concerned about the birth family sharing private information with others viewed disclosures to the birth family as risky. These privacy concerns related to adoptive parents being more clear with the birth family about preferences for sharing that private information with others. More social media contact between birth and adoptive parents predicted increased perceptions of risk of disclosure to birth parents. Results advance CPM theorizing by underscoring the motivational bases of perceived risk, the importance of anticipated boundary turbulence, and the nuanced privacy management processes within communication modes.