Drax is one of the Guardians of the Galaxy.
When he first appeared he made it clear that his driving motivations was to kill Thanos.
Thanos, Drax explained, had killed his family.
Marvel movie fans wondered how Thanos killed Drax family.
Now, according to ComicBook.com, Joe Russo has revealed the family's cause of death.
Russo revealed that Thanos went to Drax planet and wiped out half its inhabitants.
Drax family was among the half that died.