In cases like this, the Father’s Church trumps the Mother’s Church. Fortunately in this case with Orthodox and Catholic it’s two sides of the same coin. Yes we are in schism with one another, but both Churches are Christ’s One Holy Catholic and Apostolic Church as both Churches lead souls to Heaven and have all seven valid Sacraments, a valid priesthood, etc. This would be a bigger deal if it was a Catholic/Protestant, Catholic/Muslim, etc marriage (where one party is not part of a sacramental church).