Within the Roman Catholic Church, the titles sister and brother are given to members of religious communities. Members take vows of poverty, chastity, and obedience and devote their lives to God. Sisters and brothers generally view their way of life not so much as a career but as a vocation—a calling.Click to see full answer. Also know, what is the difference between a Catholic brother and father?A “Father” is a priest who is also religious (monk or friar) or a religious who is also a priest. A “brother” is a monk or friar, that is a religious, who is not a priest. A religious woman cannot be a priest. The “sister” is a nun or religious who is not … can Catholic brothers marry? The Roman Catholic Church bars most married men from becoming priests, but that rule, could, in theory, be changed. But those who would like to see married priesthood argue celibacy is so difficult for many men that it dissuades people from the priesthood and can lead to sexually immature people pastoring their flocks. Also to know, what does a religious brother do? A religious brother is a member of a Christian religious institute or religious order who commits himself to following Christ in consecrated life of the Church, usually by the vows of poverty, chastity and obedience. It is also common in many Christian groups to refer to other members as “brother” or “sister”.Who is a reverend brother?Internally, members of the priesthood do not use The Reverend as a style, but are generally known as “brother” or “sister” or by their specific priesthood office (“deacon”, “teacher” or “priest” are often appended after the person’s name, instead of, for example, “Deacon John Adams” or “Deacon Adams”, and generally