The problem I am having is that her entire family is falling apart while she and I are going thru this...one of her sisters is at odds with everyone, her mother is kind of getting in the middle of all three of the sisters and stirring the pot, her oldest sister is an addict that seems to be going back down the wrong path.
It's unfortunate that the family has been allowed into all this. It's always best to not involve them, because they will push and pull in ways that only hurt.
Now that the cat's out of the bag, you still would be best advised to back away from any conversations about your marriage with them. You can say you consider it a personal matter and that you plan on making sure that you and the kids will be ok... and then change the subject.
Find one or two people you can confide in who you can trust to keep things to themselves for support.
M: A really long time. Crisis: 5 years. She's still worth it.
Life is never made unbearable by circumstances, but only by lack of meaning and purpose. -Viktor Frankl