More than three-fourths of older adults with developmental disabilities and mental illness live in the community with aging parents, the majority of whom do not complete plans for the residential, financial, and legal future of their offspring. The authors used a true experimental design to evaluate the effectiveness of a six-week psychoeducational group intervention with 27 older mothers. Data collected in pre- and post-test telephone interviews were analyzed with repeated measures MANCOVA to test five hypotheses. Significant multivariate effects were found for mothers' knowledge and awareness about permanency planning, confidence and competence to plan, planning activities, and stage of planning. Findings support use of group interventions with older parents and underscore the need for professional education about planning for adults with special needs.