Anger = Healing?

[Livin4ME]

ok guys, I need your prayers tomorrow. New Years Eve my MIL's sister died of a massive heart attack, tomorrow is the funeral. MIL wants me there and I want to be there for her. STBX is bringing OW. Perfect timing for introductions seeing as emotions are going to be so high.
I'm very upset by this because I feel stbx is drawing a line tomorrow. Neither one of us have ever asked his family to choose sides. Thru all of this, they have welcomed me on all occasions and been there for me because my family lives so far away. I do not ask what stbx is up to, what they've talked about with him, nor do I ask them to speak to him about our relationship. It's none of my business and I respect their relationship with him. I've grown very close to them all, especially his mother. He on the other hand, has distanced himself a great deal from his family.
I understand this is HIS family and he has every right to bring her. And if MIL had not asked me to be there with her, I would only make an appearance before they arrived. But she has insisted that I be there with her for the duration of the day. And like I said, I want to be there with her.
The thing is, his family has made it quite clear that they want nothing to do with OW until the D is final. FIL had the opportunity to meet her last summer at my house and he refused. Instead, having me bring the kids out to the front so he could see them while stbx and OW stayed in the back yard.
He brought OW to the hospital and back to his aunt's house the night she died. OW sat in the car the whole time. He asked his mom if she could come in and she said no. Knowing all this and why he would still bring her to the funeral is beyond me. And I find it quite disrepectful to his family.
And to be honest, I feel he's drawing the line saying, "this is MY family. WE are here now, you can leave." And I feel that even tho his family has insisted they will not having anything to do with her until it's final, he is pushing her on them.
So I'm asking for prayers for tomorrow, not only for the family as they mourn their loved one, but also for myself. I pray that God gives me a clear head to be there for MIL, courage to be there for her, and guidance on how to handle the situation.