Relationship to Rite
Canon 111/1:A child of parents who belong to the Latin Church is ascribed to it by reception of baptism, or, if one or the other parent does not belong to the Latin Church and both patents agree in choosing that the child be baptized in the Latin Church, child is ascribed to it by reception of Baptism; but if the agreement is lacking, the child is ascribed to the Ritual Church to which the father belongs.

Choice at Baptism:Adults
Canon 111/2:Anyone to be baptized who has completed the fourteenth year of age can freely chose to be baptized in the Latin Church or in another Ritual Church sui iuris, and in this case the person belongs to that Church which is chosen.

Change of Rite
Canon 112/1 :After the reception of baptism, the following are enrolled in another ritual Church sui iuris:

112/1/1:One who has obtained permission from the Apostolic See;

112/1/2:A spouse who declares at the time of marriage or during marriage that he or she is transferring to the ‘ritual Church sui iuris of the other spouse; but when the marriage has ended, that person can freely return to the Latin Church:

112/1/3:Children of those in nn. 1 and 2 under fourteen complete years of age; and similarly children of a Catholic party in a mixed marriage who legitimately transferred to another ritual Church. But, when such persons reach fourteen complete years of age, they may return to the Latin Church”. Canon 112/2:“The custom, however prolonged, of receiving the sacraments according to the rite of another Ritual Church sui iuris, does not carry with it enrollment in that Church”

Worship and Spirituality
Canon 214:The Christian faithful have the right to worship God according to the prescriptions of their own rite approved by the legitimate pastors of the Church, and to follow their own form of spiritual life consonant with the teaching of the Church.

The Bishop as Pastor
Canon 383/2:“If he has faithful of a different rite within his diocese,he is to provide for their spiritual needs either by means of priests or parishes of that rite or by means of an Episcopal vicar ”

Churches sui-iuris and Rites
Canon 27:A group of Christian faithful united by a hierarchy according to the norm of law which the supreme authority of the church expressly or tacitly recognizes as sui iuris is called in this code a Church sui iuris.

[Definition of the rite ]
Canon 28/1:A rite is the liturgical, theological, spiritual and disciplinary patrimony, culture and circumstances of history of a distinct people, by which its own manner of living the faith is manifested in each Church sui iuris.

Canon 28/2:The rites treated in this code, unless otherwise stated, are those which arise from the Alexandrian, Antiochene, Armenian, Chaldean and Constantinopolitan traditions.

Enrollment in a Church sui iuris
Canon 29/1:By virtue of baptism, a child who has not yet completed his fourteenth year of age is enrolled in the Church sui iuris of the catholic father; or the Church sui iuris of the mother If only the mother is Catholic or if both parents by agreement freely request it, with due regard for particular law established by the Apostolic See.

Regarding the enrolment of children under,14 year of age,of children of unwed mother,unknown parents etc.
Canons 29/2:If the child who has not yet completed his fourteenth year is:

Canon 29/2/1:born of an unwed mother, he Is enrolled in the Church sui iuris to which the mother belongs;

Canon 29/2/2:“born 0f unknown parents, he is to be enrolled in the Church sui iuris of those in whose care he has been legitimately committed are enrolled; if it is a case of an adoptive father and mother, Canon 29/1 should be. applied”.

Canon 29/2/3:“born of non baptized parents, the child is to be a member of the Church sui iuris of the one who is responsible for his education in the Catholic faith”.

Canon 31 :No one can presume in any way to induce the Christian faithful to transfer to another Church sui iuris.

Canon 32/1 :No one can validly transfer to another Church sui iuris without the consent of the Apostolic See.

Canon 32/2:In the case of Christian faithful of an Eparchy of a certain Church sui iuris who petition to transfer to another church sui iuris which has its own eparchy in the same territory, this consent of the Apostolic See is presumed, provided that the eparchial bishops of both eparchies consent to the transfer in writing.

Canon 33:“A wife is at liberty to transfer to the Church of the husband at the celebration of or during the marriage; when the marriage has ended, she can freely return to the original Church sui iuris” [see also canon 34-38].

The Preservation of Rites
Canon 39:The rites of the eastern Churches, as the patrimony of the entire Church of Christ, in which there is clearly evident the tradition which has come from the apostles through the Fathers and which affirm the divine unity in diversity of the Catholic faith, are to be religiously ‘preserved and fostered”.

Canon 40/1:Hierarchs who preside over Churches sui iuris and all other hierarchs are to see most carefully to the faithful protection and accurate observance of their own rite, and not admit changes in it except by reason of its organic progress, keeping in mind, however, mutual goodwill and the unity of the Christians.

Canon 40/2:Other clerics and members of institutes of consecrated life are bound to observe their own rite faithfully and daily to acquire a greater understanding and a more perfect practice of it.

Canon 40/3:Other Christian faithful are also to foster an understanding and appreciation of their own rite, and are held to observe it everywhere unless something is excused by the law.

Canon 41:The Christian faithful of any Church sui iuris, even the Latin Church, who have frequent relations with the Christian faithful of another Church sui iuris by reason of their office, ministry, or function, are to be accurately instructed in the knowledge and practice of the rite of that Church in keeping with the seriousness of the office, ministry or function which they fulfill.

Canon 148/1:“It is the right and the obligation of the patriarch to seek appropriate information concerning the Christian faithful who reside outside the territorial boundaries of the Church over which he presides even through a visitor sent by himself with the consent of the apostolic see”

Canon 148/2:“The visitor, before he begins his function, is to go to the eparchial bishop of those faithful and present his letter of appointment”

Canon 148/3:“After the visitation is completed, the visitor is to send his report to the patriarch, who, after discussing the matter in the synod of bishops of the patriarchal Church, can propose opportune means to the Apostolic See, in order that everywhere in th world he might provide protection and an increase of the spiritual good of the Christian faithful of the Church over which he presides, even through the erection of their own parishes and exarchies or eparchies”.

Canon 193/1:‘The eparchial bishop to whom the care of Christian faithful of another Church sui Juris are committed is bound by the serious obligation of providing all the things in order that these Christian faithful retain the rite of their own Church, cultivate and observe it as much as they can; he should foster relations with the higher authority of that Church ”

Canon 193/2:“The eparchial bishop is to provide for the spiritual needs of those Christian faithful, if it is possible, through presbyters or pastors of the same Church sui juris as the Christian faithful or even through a syncellus constituted for the care of these Christian faithful”

Canon 193/3:“Eparchial bishops, who appoint such presbyters, pastors of syncelli for the care of the Christian faithful of patriarchal Churches, are to formulate plans of action with the patriarchs who are concerned in the matter and, if they are in agreement, act by their own authority and notify the Apostolic See as soon as possible; if the patriarchs, for any reason whatever, disagree, the matter is to be referred to the Apostolic See”