This can be very confusing...especially with the holidays around the corner.
What would you say in your response to W's text?
I would suggest that you not tell the kids since you two are feeling mixed up emotionally and one would not want to leave less than positive memory of the holidays in the kiddo's minds.
Goodness...I've read so many stories here and IRL about how people relay that their parents dropped the bomb on their birthdays, Xmas, or some special occasion. The sad thing is that their memories of the special day is forever associated with the bomb day.