Rocco, so sorry about your nephew. You were there for your family, that's what they needed.
I am glad you went on with plans for the kids, they probably needed it. It's okay if the kids saw your grief, I'm sure they are very sad over the loss of their cousin, too.
Sometimes a child can teach us so much about life, about what is really important. As time goes on, you will remember less of the final moments and what will remain will be a joyous life to celebrate.
I am glad to see your W consoled you; it shows you she does have a heart after all. Maybe she is an overwhelmed person with a lot of care on her shoulders. I'll say a prayer for your family. L