- Is it the case that for Orthodox and Eastern Catholics a marriage is neither valid nor sacramental if it is outside the Church (say between Presbyterians)?
- Would the marriage of a Presbyterian couple converting become valid through economia? Would there be any difference if only one of the couple converted?
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Two validly baptized Christians who marry (say two Presbyterians) have a valid and sacramental marriage in the eyes of the Catholic Church. Nothing changes if they are received in to the Church, one or both of them. Let me add, they had to be free to marry each other when they did marry. Their present marriage had to have been either the first marriage for both or if one had a prior marriage that spouse deceased. If one partner was divorced then he/she would be considered still married to the previous spouse. There are some
other impediments to marriage (consanguinity, close blood relatives cannot marry one another for example), and these do vary in the Eastern Churches from those in the Latin Church, but typically the impediment would be any prior marriage with that spouse still living.