It’s subtle but it’s strongly implied from the subtext of Zoro’s flashback and Mihawk’s conversation with Perona.
When Perona first met Mihawk, she asked him to bring her a hot cocoa and he told her to stfu while he was reading the news about Moria. During Zoro’s Dressrosa flashback you can see Perona and Mihawk drinking the same wine from the same glasses, implying that Mihawk became friendly enough to share wine with his guests. Since Zoro mastered CoA I assume he went back to drinking since he likes it so much.
During Perona’s conversation with Mihawk, it appears that they cooked each other meals, with Mihawk doing the most cooking. I doubt Mihawk would just let Zoro freeload and would probably make him cook too. The fact that Mihawk and Perona were seen eating Onigiri together, which is Zoro’s signature food, implies that he introduced them to it. So yeah, I think Oda has been subtly hinting at the Kuraigana 3 having a family-like relationship.