These two guides address the questions that sit behind many sister-site searches: how to prove a connection, and whether a connected brand changes the rules for a welcome offer.

How to verify whether two casinos are sister sites in Britain starts with the two exact hostnames. It shows how to read operator terms, search the Gambling Commission's business register where a GB licence is claimed, and distinguish a separate brand from another address for the same service. Similar games or an affiliate roster are leads to investigate, not proof of common operation.

Do sister casinos share welcome-bonus eligibility? addresses a different decision. A common owner can make cross-brand exclusions possible, but only the current promotion and account terms determine whether a person qualifies. The guide separates restrictions based on person, account, household, payment method and prior group history. It also explains what to preserve if an exclusion is disputed, without treating a bonus as a reason to deposit.

Both pieces use “UK reader” to describe the audience and “Great Britain” when referring to the Gambling Commission's licensing jurisdiction. The Commission's business register records business and domain information; it does not publish every promotion rule. Likewise, an overseas licence does not authorise service to GB consumers. A person should check the exact site and the governing documents before relying on either a sister label or a promotional headline.

The Sister Sites directory applies the method to six named investigations. Our editorial methods explain the source ranking: regulator records and identified operator documents carry a different weight from a network or affiliate list.