How do parent-company domains affect child-brand deliverability?

Parent-child domain relationships create reputation connections:

Inheritance at launch where new subdomains may benefit from parent domain trust, accelerating initial warmup.

Organizational association where providers may detect relationships between separately-operated domains and consider them together.

Contamination risk where severe parent domain problems may trigger increased scrutiny of child brands using related infrastructure.

The connection is not deterministic. Child brands can develop independent reputations that diverge from parent status, especially with deliberate isolation.

Brands wanting maximum independence should use completely separate root domains rather than subdomains to minimize association.

Parent-child domains are like corporate subsidiaries. Each can build their own reputation, but the holding company's scandals may prompt regulators to examine all related entities more closely.