I am sorry to read that your SIL is going through the same thing. Parents do not realize how their actions can affect their children once they are grown.
You will be there for her because you know exactly what she is experiencing. She will need lots of support and someone to listen as well. Both of you will be traveling this road together and it's a shame that this has happened to both of you.
We didn't ask to be participants on this journey, but we are. The only way to get off the merry-go-round is to determine when you have had enough and are ready to put your feet back on the ground and focus on yourself and make your life a good one while they are on the Mother Ship. It's not easy, but it can be done, one step at a time.
Mourning the loss of a marriage takes time. There will be days when you want to scream, cry and curl up in a ball. Feel the emotions and then let them wash over your back and down the drain. In time, you will feel better and can smile once again.
When speaking to your SIL, please emphasize that if she decides to come here and be a member, she must not share her information w/her h. This is her place of refuge and he does not need to know what she posts.
Now, as a gentle reminder, you have reached the 100 posting mark. Please start a new thread and link this one to it.
Sending lots of positive thoughts your way and to your SIL.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.