I would suggest that you gently inform your Ds that they might want to bring their concerns to W. You cannot always shield your daughters all the time. They're grown women and if they persist...you can validate and comfort them...however, I think it is important for your daughters to feel that they are allowed to express their feelings to their Mom.
Not say, tell Mom this and that. Just simply say:
"I would encourage you to talk with your Mom. I can see that this is a difficult time for you. I want you to have a relationship with her regardless of what Mom is going through at the moment. It is not healthy for you to stuff your thoughts and emotions around Mom. Make sense?"
Sometimes children (grown or not) can be a bit afraid to express their true feelings with their Mom and/or Dad.
