Lucius and Narcissa were in the Black family crypt burying Arcturus Black. Narcissa received a letter from her great-aunt Cassiopeia that Arcturus sadly died. Narcissa went into mourning for a few days and Lucius had taken care of their son. Draco was firstly confused, why his mother was not here with them, but his father told him that his great grandfather had recently died. Draco understood it and left his mother to have some place to mourn.