His family had all died two hundred years ago. That's what happened when you lived longer than humans. He didn't think about it anymore. His brothers were all the family he needed. "Hy don't... have anyvun but my brodders. And de Mistress." Obviously his life revolved around his Mistress. It always had, through a succession of Heterodynes over the past centuries. Even the nineteen years when they thought there wouldn't be another Master, he'd kept searching... And then they'd found Miss Agatha.