Let's focus on the four important people here. No need to think about "them". They may be happy, they may not be happy. That doesn't need to be important to you. If you are the best Treese you can be, the best Mom you know how to be, you are going to be happy. In time, dates like this will become less important. I'm not going to say they will go away, because he was a big part of your life for so long. But he, and the calendar for that matter, don't get to cause you grief now!