My tree is still up, I would never take it down before the 6th, and usually have it up longer because I love the lights on during the dark evenings of winter. I always try to have it down by February ..or my birthday on Feb 17! Usually it goes up in early Dec., but this year not until the 23rd!
As for grieving at Christmas time....my Dad died on Christmas morning 14 years ago. While my siblings and I were deeply saddened, we all felt it was the best Christmas gift he could have gotten. He was 91, failing quickly, and wanted to join our mother. We went on with our celebrations that day and were sure he was right there with us. Every year since, the first ornament on my tree is a set of angel feathers to remind me that Mom and Dad are there, as well as 2 of my siblings, enjoying the season with me. It keeps me from missing them quite so much.