Sadak, It's okay to have family and inlaws in for visits, but try not to share too much of what is going on w/your wife right now. No matter what they say or do w/respect to her and what she's doing, she will not listen to them and will turn a deaf ear on them and think you put them up to it. The more someone tells a child not to so something, the more they are determined to do it...mlc is the same way.
Your children love you and just be yourself with them. They need to know that you are the one stable person in their lives right now.
Come here to vent or talk. This is the best place to come and journal. There are posters here all of the time and are more than willing to read, listen and respond back to you. It is a safe haven for all of us. No one in the real world will understand what you are going through unless they have walked in your shoes.
Good luck with your finals!
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.