And Mahlon and Chilion died also both of them;
Ruth 1:5
The 2 Sons died. This would represent the groups in the grave at His 2nd Advent (Return). One group is raised - and one group isn't at that time. (death is "soul sleep"--awaiting the resurrection in the grave).
I tell you, in that night there shall be two men in one bed;
the one shall be taken, and the other shall be left.
Luke 17:34