Secular Orders are not associations that are connected to a religious order. They are not oblates either. They are real orders that are canonically erected by the Hoy See. I believe that the Secular Franciscan Order (SFO) is probably the most structured, because it is the oldest; but I could be wrong on that. They are not attached to the friars in any way or to the nuns. The Franciscan Third Order is an independent canonical order with its own rule of life written by St. Francis and its own constitutions approved by the Sacred Congregation for Institutes of Consecrated Life and Societies of Apostolic Life, just like any order of frias, nuns, monks, sisters or brothers.
They do have a lengthy formation period and go through all the steps of postulancy, novitiate, temporary profession and perpetuial profession. The only clerics that are allowed to join the Franciscan Seculars are diocesan clerics, because they do not belong to any religious community. Canon law does not allow a Secular Franciscan to leave without the proper dispensation after he or she has made perpetual profession. They must apply to the Major Superior to permission to leave, which is usually the Regional Minister. They also have their own Minister General in Rome, just like each of the orders of friars and nuns do. If a Secular Franciscan wants to join another order, there is a canonical process that he or she must go through to do so. No order or congregation may accept a Secular Franciscan until he or she has been released from the SFO. I have seen it happen in my own community. Three of our brothers were Secular Franciscans. No one gives you a hard time about it. It’s just that you can’t decide to join another order without going through the proper process.
The Third Order Regular (TOR) is the other branch of the Secular Franciscan Order. They are the friars branch. They were originally a group of Secular Franciscans who wanted to live the conventual life. Pope Gregory IX gave them permission to do so and called them Regulars. That’s how they got that name. But they follow the same rule as the Secular Franciscan Order. There is only one rule for the Franciscan Third Order. It’s called the Rule for the Brothers and Sisters of Penance. The TORs have their own Regional Ministers and their own Minister General. They also have their own constitutions which interprets the rule in a manner that allows them to live the conventual life. All that being said, this is a separate order from the Friars Minor that St. Francis also founded and to which he belonged. The Friars Minor have their own rule and their own government given to them by St. Francis as well. Then there are the Poor Clares who also have their own rule and their own government. But all three orders have the same spiritual father who is the law giver and the model.
I believe that the Dominicans have a similar infrastructure; but I may be wrong. I don’t think that the Secular Carmelites have autonomy. I think that they are governed by the friars and follow the rule of St. Albert as do the Carmelite Friars.
As to priests, in the Franciscan family it’s up to the Minister to decide whether you have a vocation to Holy Orders. You may have a vocation to the Franciscan life, either as a friar or a secular, but not have a vocation to Holy Orders. Therefore, you are not allowed to enter any Franciscan community with the intent of being a priest. You enter with the intent of being a Franciscan. You communicate your desire to be a priest, but you must submit to obedience and let the major superior call you to ordination, if he believes this is Christ’s will. His voice is final. It cannot be appealed. You can find yourself in final vows, committed to the Franciscan life and communnity until death and never be ordained. This rarely happens, because as you go through the formation program your vocation to the priesthood is always being discerned by you and the superior. Usually, before you make final vows, you have an idea of whether or not you will be allowed to be ordained. But there have been some surprises.
With the Secular Franciscans this is a little different, because the only clerics who can join are diocesan. These men are called to Holy Orders by the local bishop, not the Minsiter of the community. The idea in Francis mind was to keep the order as secular as possible, while at the same time giving it a religious form of government and life that can be lived in the secular world.
I hope this helps.
Fraternally,
Br. JR, OSF