Sister Churches

Sister Churches is properly said of Particular Churches among themselves, or analogously of groupings such as patriarchates or ecclesiastical provinces. The Particular Church of Rome can be sister to another Particular or Local Church. The expression can also describe relations between Catholic and separated Eastern Churches because they possess Apostolic Succession, valid episcopate, and Eucharist.^[1]

The phrase expresses a genuine sacramental bond despite division. It does not mean that the Churches are in Full Communion or that doctrinal and canonical disagreements are irrelevant. Its ecumenical use should serve the restoration of unity rather than turn separation into a settled parallelism.

The one Universal Church is mother, not sister, of the Particular Churches. It is therefore improper to place the Catholic Church as a whole beside one Orthodox Church, the totality of Orthodoxy, the Anglican Communion, or an Ecclesial Community as though two universal Churches jointly exhausted the Church of Christ.^[2]

Phrases such as our two Churches require care because they can suggest that the one Church confessed in the Creed no longer exists and must be reconstructed from equivalent halves. The Church of Christ subsists in the Catholic Church even while true Particular Churches and ecclesial gifts exist outside full Catholic communion.^[3]

The CDF's Note restricts the proper expression to bodies with a valid episcopate and Eucharist. Reformation Ecclesial Communities lacking those realities are Christian partners in dialogue but are not Sister Churches in this exact sense.^[4]

The distinction is not a protocol ranking or an insult. It follows from the same Eucharistic ecclesiology that distinguishes a Particular Church from a community possessing Baptismal Communion without sacramental episcopacy.