Assign task to more than one person

We often have times that we need to assign a task to more than one person. This often happens when alerting our team to a grant check that will be coming in (we have two people who input checks) or might need to meet with a major donor. Currently we must create a separate task for each person and it creates more work because there is no to allow the two tasks to "talk" to each other to know when it is completed. By allowing us to assign the task to more than one person, when one person finishes the task, they can mark it as complete and it will disappear off the task list for both people. That way they will both know it has been completed.