The characters in "Immortal in Death" lack the experience of true family bonds, having only encountered trauma and hardship throughout their lives. Their shared history of cruelty and neglect has shaped their understanding of relationships, making them long for a connection that has always eluded them. This common background of suffering appears to be the reason they find solace in each other.
Through their struggles, both individuals have managed to reconstruct their identities despite the abandonment and despair they faced. Their resilience and determination to overcome adversity allow them to connect deeply, forming a bond that signifies the possibility of building a new family together, even if it is rooted in their painful pasts.