Can I tell duplex tenants that their neighbors are on vacation?

[Jibu V.]

Residents in one unit are on vacation and informed me ahead of time (as required by lease). A few weeks into the vacation, the residents in the other unit asked if their adjoining neighbors are on vacation. Is it okay to let them know that? Do I need to abide by any privacy or safety concerns before letting them know that? Do I need to get the permission of the vacationers? While these particular residents are fantastic and probably just asking out of concern from not seeing their neighbors in weeks, I am asking here so that I can understand what the standard practice is for others who have faced this. Thanks in advance.