It is important to tell kids it's not their fault however if you say it too much then that won't help.
The human mind doesn't process negatives well, this is especially true for children. So "don't drop the vase" is heard as "drop the vase".
It is important to say what you say in a positive way. Better to say "this is adult stuff".
Another observation be careful what you say and how you say it about other adults or children to WW. It sounds like punishment and will cause rage and pay back. WW may do all she can to alienate supportive adults and could punish her child. At the moment you may want to document this and I suggest you start to be protective of yourself and your children. You can't change WW stance by relaying this stuff to her so telling her isn't going to make her go "I must change this today, immediately because I am causing damage". She is more likely to become more entrenched in her views.
I truly believe in hugs and keeping your children's confidence.
You are truly becoming a wonderful dad for your children.
V
Freedom is just another word for nothing left to loose. V 64, WAW