Over 40 million Americans provide unpaid support to an adult relative for tasks including accompanying them to doctor visits and/or supporting them in medical decisions. Over the past several years—and particularly amid COVID-19—there has been increasing interest and demand for caregivers to be more involved in communication with providers to support patient engagement and patient-centered care as evidenced by recent state and federal policy initiatives to expand support to caregivers. One way to improve communication between caregivers and providers is through an online medical record (patient portal), which enables patients to acquire important health information and communicate with medical providers. However, caregivers’ access to adult care recipients’ portals is limited and varies across healthcare organizations and states. The objective of this study was to determine the relationship between socio-demographic attributes and responsibilities of caregivers and likelihood of (a) communicating with recipients’ providers and (b) accessing recipients’ online records.