Many Catholics do not know that there are 22 rites within the Catholic Church, the largest being the Latin rite. Our family is Maronite Catholic. Wonderful to learn. We have a few members of our Church who are Orthodox but are really unaware of their faith. They attend because they are Lebanese not because of the rite. If one is not Orthodox, one would need to speak with the priest of the Orthodox Church. We did speak with one and we may attend the Divine Liturgy/Mass but may not receive Holy Communion. We are thinking of attending but will still need to attend a Divine Liturgy/Mass where we can receive Holy Communion so not to miss out on the wonderful privilege of receiving Our Lord.
I believe the Orthodox Churches have valid ordinations and consecration of the Eucharist but as they do not hold that the Pope is the head of all Catholics, they are not in full communion with Rome.
I may be wrong so someone please validate or correct me.
A.M.D.G.,
Kimberly