**He can ask, but booking and paying does not automatically entitle him to know who stayed with you.** Assuming you’re an adult and the reservation is in your name, you should expect privacy concerning your visitors. However, whether the hotel may disclose particular details depends on the country, its policies, and how the booking was made.

**You cannot be certain he won’t find out.** If the reservation uses his email address or booking account, he may see reservation updates or billing information. Hotel privacy policies allow some sharing to administer bookings—for example, [Hyatt’s policy](https://world.hyatt.com/content/gp/en/privacy/guest-policy.html) permits sharing information with the platform used to book the stay. That does not establish a right to your friend’s identity, but it means the booking arrangement matters.

Before your friend stays, contact the hotel directly and say:

> “The reservation is in my name, but my father booked and paid for it. Please keep information about my visitors and accompanying guests private. What information can he access as the booker or payer, and could an additional guest’s name appear on any confirmation or bill sent to him?”

Also confirm whether your friend must register or show ID. A booking for two people may permit the overnight stay, but the hotel can still require both guests’ details. Ask for your privacy request to be recorded on the reservation.

What country is the hotel in, and are you 18 or older? Those details would help clarify the legal position.