GG, I truly hope you have a very merry Christmas. Maybe you and your Sister can start a new tradition for your children. I know you like to cook, maybe you could bake something new. Try not to make the day center around your Husband's absence, it is his loss. Take tons of photos of your special day with the kids and your Sister.
My Husband has looked through the Family albums and has seen the things he missed, all of the special days, Christmas's, Graduation's, Thanksgiving's and Easter's.
Life really does go on, and you will get to a point where it doesn't affect you as much anymore. Yes, he will be missed but like I said, his absence or presence doesn't mean that your life needs to revolve around his.
Sending you blessings and smiles.
(((hugs)))
There can be no testimony without a test. I am praying to go through this test and come out the other end with a new and better marriage then before.