Both should understand how to be the master of the other, by virtue of their relationship. The fallen world wants to cut these Four Great Realms of Heart. By loving the elder brother we can develop our love. God Himself cannot develop without the family. True love is not centered on the self.
True love starts for the sake of others.
It is concerned about each pole of all relations. We have to restore these. The satanic world completely destroyed these relations. Love can forgive anything, except for the murder of the Four Great Realms of Heart, of the father, mother, brother or sister - only the Messiah can forgive those. After Blessing 99, everyone down to the elementary school level will recognize true God and Reverend Moon.