Custodial grandparents play a significant role in sustaining healthy families, but the caregiving is demanding. A social research design and development process informed a school district‐university partnership project responding to the needs of a group of custodial grandparents. Three phases of the project are described: (i) needs assessment; (ii) design and implementation of a psychoeducational group facilitated by social work faculty and a school district administrator; and (iii) evaluation of programme impact. Major themes from the needs assessment and evaluation are presented. Discussion highlights the need for school and family engagement, recognition of the significant changes in family role required for grandparents, and viewing custodial grandparents as leaders and engaged caregivers. The meaning of diversity in group intervention for this population is also explored.