Serena Williams and Alexis Ohanian are making unforgettable memories with their eldest daughter.

Williams and Ohanian appeared to be enjoying some special private time with Olympia. Dressed as pirates, the pair went on a treasure hunt with Olympia, which involved digging up “a deserted island in the Caribbean.”

“A mischievous pirate stole a bunch of gifts for Jr and she had to make a map, find buried treasure on a deserted island in the Caribbean and dig it up. I think we all know who digs the most,” Ohanian, 40, captioned a photo of him helping his little girl dig.

Another set of photos shared by the former tennis pro, 42, showed more footage of their island adventure.

In November, the 23-time grand slam champion revealed that Olympia is successfully “navigating” being an older sister to Adira.

“She loves it,” Williams told Entertainment Tonight at the CFDA Awards. “Adira’s like a tiny little 𝚋𝚊𝚋𝚢, so Olympia just calls her her little sis.”

Per the outlet, Williams explained that Olympia “prayed for a sister” but revealed she herself was a little “worried” ahead of Adira’s arrival.

“I was like, ‘OK, I don’t know if I can like anyone as much as I love Olympia,’ ” Williams said. “I was really nervous about that. But I feel like it all worked out.”

The couple first announced Adira’s arrival on TikTok. In the video, shared to Williams’ account, the family could be seen sitting at a table, with Olympia leaning on Williams as Ohanian typed on a laptop in front of them.

Williams then stood up and said she’d be right back, before returning with a tightly swaddled 𝚋𝚊𝚋𝚢 in her arms. As Williams sat back down between her husband and daughter, both admired the infant and Olympia planted a kiss on her 𝚋𝚊𝚋𝚢 sister’s forehead. The TikTok ended with two cute Polaroid-style shots of the new family of four.

“Welcome my beautiful angel,” the sportswoman captioned the video.