For almost anything you do during this part of your life, the maxim is do what you want to do. Not what you think you should do, or what others want you to do (or think you should do), just what you want. Hard enough to know that yourself, sometimes! So if you will benefit by their presence, say yes. But if you feel you want to get your head around this by yourself, tell them to come next day. Let them be a part of it all though, You want to protect your children from worry, but the reality may be less confronting than what they can imagine, if they are out of the loop too much. Some practical tasks to help you in the coming weeks may be a useful channel for their energies and feelings. Best wishes.