Thank your Ladislaus for your good advice and information in your posts #37 and #38, especially the following from #37:
When I was in the eighth grade (1964 - 1965) at a parochial school our teacher's (Sisters of St. Joseph of Carondelet) previous school had several students from a nearby Eastern Catholic parish (I don't recall which jurisdiction). We received a bit more understanding of the Eastern Catholic's than most Roman Catholics did. While every Catholic belongs to one and only one of the 24 (or so) Catholic rites in full communion with the Pope, any Catholic may attend the Divine Liturgy / Mass of any of the other Catholic rites to fulfill their Sunday or Holy Day obligation, make a confession, and receive Holy Communion if they are properly disposed. They may also participate in the general life of that parish (catechism classes, devotions, social events). During the U.S. immigration wave of the 19th and early 20th centuries most Catholics from Slavic countries needed to attend Latin Rite Masses and have their children baptized in the Latin Rite until Eastern Rite missions and parishes could be established.
Where I live in the Tri-Cities (Pasco, Kennewick, Richland) of eastern Washington the Ruthenian priest from Spokane comes down once a month for a Sunday evening Divine Liturgy, which I attended last evening. The liturgy is held in one of the local Roman Catholic churches and is considered an outreach of the Spokane parish, the next step being to become a mission of the eparchy (diocese).
Yes, and if there was a bit of hesitation it was in the reverse direction, where they preferred that Eastern Rite Catholics avoid switching to Roman, since they were concerned about the Roman Rite absorbing the Eastern Rites, since, well, if you have a Roman Rite church at the end of the street vs. having to drive 30 minutes to an Eastern Rite one, then out of convenience entire family lines were getting assimilated into the Roman Rite. Going in the other direction was less of a problem, and permission to even change Rites from Roman to Eastern was readily granted, though not so much in the other direction.
Normally, you would not have received Baptism, Confirmation, or Holy Matrimony in the Eastern Rite church before Vatican II ... but given 1) the current state of the Church where almost no Traditional Catholics belong to a canonical "parish" or "diocese" and 2) given that the Eastern Rites currently have no issues providing Chrismation (Confirmation) and other Sacraments to Roman Rite Catholics even if they don't change Rites (I have asked), I think there's no problem with that either. Eastern Rite churches will allow you to register as "parishioners". I believe they've adopted that attitude, again, in order to draw numbers. I've had the priests there tell me that many of their churches are kept afloat financially from Roman Rite refugees, and so that's one reason they don't really want to dissuade them by giving them a hard time.