Keep them out of it. Tell the family and friends to also refrain from any comments around the kids.
In time the kids will form their own opinion. When they do, they will look at you and God willing, will thank you for never bashing dad.
God Bless, Eric
"The difficulties of Life are intended to make us BETTER,not bitter". "Fear is a prison, where you are the jailer. FREE YOURSELF!" "Life is usually all about how you handle Plan B." - Jack3Beans