The Congregation of the Sons of the Most Holy Redeemer (Latin: Filii Sanctissimi Redemptoris; FSSR), commonly known as The Sons and The Transalpine Redemptorists, are a religious institute of the Catholic Church canonically erected in the Roman Catholic Diocese of Aberdeen and based on Papa Stronsay in the Orkney Islands, Scotland, as well as in the city of Christchurch, New Zealand, until July 2024.

They were formed in 1988 as a traditionalist offshoot of the Redemptorists, following a monastic rule based on that of Saint Alphonsus Liguori, and was later formally erected as a religious institute in 2012.

[3] In June 2008, the community petitioned the Holy See for reconciliation and this was accepted by Pope Benedict XVI who declared them to be in "canonical good standing" within the Catholic Church.

They changed their official name to The Sons of the Most Holy Redeemer (FSSR), and made alterations to their religious habit in order to more clearly differentiate themselves from that of the Redemptorists.

[10] In 2023, a New Zealand journalistic investigation suggested[11] abuse within the community, including multiple exorcisms being conducted on children without the approval of the local Bishop.