Albert Barnes on Matthew 22:25-28

There were with us seven brethren. It is probable that they stated a case as difficult as possible; and though no such case might have occurred, yet it was supposable, and in their view it presented a real difficulty. The difficulty arose from the fact that they supposed that substantially the same state of things takes place in the other world as here; that husbands and wives must be reunited; and they professed not to be able to see how one woman could be the wife of seven men.