This project will develop an individually tailored, interactive, web-based intervention for cancer patients (lung, colorectal, breast, prostate) and their family caregivers that will lead to better patient-caregiver communication, more dyadic support, higher self-efficacy, increased perceived benefits of the illness experience, and less emotional distress. This intervention is based on an efficacious, family-based program of care (the FOCUS Program). In this study, we will translate this primarily face-to-face, family-based program to an internet-based version.