Agree with this. I assume that one of the "wifes" is legally married to the man and the other is not legally married, but may have participated in a religious ceremony which has no legal standing.
Whereas with most weddings in Ireland, the civil ceremony is held simultaneously with the religious ceremony, it is not always the case. A religious marriage on its own has NO legal standing and confers no rights on the participants.
I have actually come across a case whereby an individual was legally married to 1 person (civil marriage) and married in the catholic church to a different person simultaneously.