I haven't submitted the task for validation yet because I already know by test-running it that it won't work. Also I used family members DOB for all the dates so I kinda don't want to post that here. Also I can't post using the code tag because the HashMap uses symbols that get treated as BB code. So here is a screenshot of current removeAllSummerPeople: I'm getting a ConcurrentModificationException. I know what that is, but I also thought using an iterator was supposed to get around that problem.