The Old Rite Brethren have their origins in a handful of families in Russia who converted to the "Old Believers" Russian Orthodox Church during the time of St. Pope Pius X. The Old Rite Brethren follow the Old Believers/Russian Orthodox Church liturgy in addition to retaining their Serbo-Russian heritage through Christ their Brother, Lord and King.
The Old Rite Brethren are part of the Russian Orthodox Church in Communion with Rome; its priests are in communion with the Holy See (especially as it existed during the time of Pope Pius X). Although in communion with the Holy See, the Old Rite is not a Latin Rite. Being part of the Russian Orthodox Church in Communion with Rome, the Old Rite Brethren are already recognized as a legitimate rite within the overall Catholic Church, being given such status by Pope Pius X.
Our doctrines are not different, but rather our heritage, cultural and liturgical practices differ from those who practice the Latin rite. We are fully Orthodox, subscribing to the ancient church of the East, and fully Catholic, being in communion with the Holy See since the time of St. Pope Pius X.
Our priest in America, Reverend Hieromonk Father Seraphim Charles Michael Allen maintains a Questions and Answers web page that can help provide additional information about the Old Believers in communion with the Holy See.