well to each his own i suppose. we are Catholic. my oldest daughter is 25 years old and is marrying her 28 yo fiance in September. under your scenario they would be deprived of consummating their marriage and of having children. obviously this josephite marriage thing is not prescribed by the Church as the common way to undertake married life.
I was kidding about the 25 yo thing obviously.
Best wishes to your daughter and her finance and I hope they experience a fruitful marriage.
That is correct; it isn't very common. However, all are familiar with the idea of living as "brother and sister".