Members of Opus Dei are encouraged to be active members of the parish in which they reside. When I got married I did so in my wife’s parish. My uncle, who was a permanent deacon, received our vows. The parish priest said the Mass. Our children were baptized in our parish and attended the parish school. They received their first Holy Communion and were confirmed in our parish, as well as the instruction leading up to the reception of those sacraments. They made their first confessions in the parish. I was a lector in our parish for many years and served on the parish’s pastoral council. I was a scout leader for over 17 years in our parish’s scout troops. My wife served on the Board of Directors of the parish’s Home/School Association. We attend weekly and daily Mass in our parish. If we can’t attend Mass in our parish we go to another parish, just like anyone else would.
Nevertheless, members of Opus Dei commit to assist the apostolates of Opus Dei and therefore often give more of their time and energy to Opus Dei than to their parish.
From a financial perspective, they contribute to their parish just as every Catholic should contribute to the financial support of his or her parish. Any contributions they make to Opus Dei are above and beyond, but not necessarily equal to the contribution they make to the parish.
The relationship members of Opus Dei have with their parish is the same as any other Catholic. They’re subject to the pastor and local bishop in everything other Catholics are subject to them in. The jurisdiction Opus Dei has over them is separate from any authority the local priest or bishop has, not in place of it, and extends only to those things that are the proper aim of the Prelature: their personal spiritual direction and the apostolic aims of the Prelature.