The Tiospaye Wakan, "Holy Family," service combines the Rite II Holy Eucharist of the Book of Common Prayer with the style and symbolism of Native American culture. Conducted in a circle, evoking the shape of the inside of a tipi, with a ceremonial fire in the center, this service provides an environment welcoming to many people who would otherwise feel uncomfortable in a traditional church setting. The room is decorated with the colors of the four directions and hangings that display symbols similar to what might be found on tipi liners.

Begun by the Rev. Dr. Martin Brokenleg on September 8, 1991, the Tiospaye Wakan service is one of three services offered each Sunday morning at Calvary Cathedral. Services are conducted by the Rev. Charles King, curate of the Cathedral, each Sunday at 12 pm. A potluck meal follows the service.  Hospitality is a key ministry of this service and all are welcome to attend.

Fr. King also serves St. Mary's Episcopal Church in Flandreau, offering Holy Eucharist on the first and third Sundays of each month.