How to handle relationships in a Flux application?

How can I handle relationships using Flux?

Lets say I have a Employee

{
    id: 1
    name: "Employee",
    position: "Manager"
}

I have some log entries retrieved from the server api, that have a reference to employees

[
    {
        id: 1,
        subject: "Subject",
        employee: {
            id: 1
            name: "Employee",
            position: "Manager"
        }
    },

    {
        id: 2,
        subject: "Subject",
        employee: {
            id: 1
            name: "Employee",
            position: "Manager"
        }
    }   
]

Currently I have 2 stores EmployeeStore and LogEntryStore.

The problem: If a employee changes his name a EMPLOYEE_UPDATED event would be triggered and the EmployeeStore will change the employee, but the LogEntryStore will still have the "outdated" employee.

Should every store that have a relationship also listen to EMPLOYEE_UPDATED? This seems inefficient to me.

How should I handle this?