Genetics is in all senses a family affair. The diagnosis of a genetic condition affects not only the patient and biological family members who may themselves be at risk, but also "family" more generally as support may be sought from those considered kin and who may or may not be at risk themselves. It is considered best practice in genetic consultations to explore who will be informed within the family when a genetic condition or risk is diagnosed, particularly when the health of other family members is at risk. There is little guidance or consensus on how to achieve the implicit goal of...