An awkward situation at a funeral

Let me tell you a little bit about my longtime friend that died of cancer last weekend. My friend was only married once in his lifetime and that marriage lasted for 12 years, producing two daughters. During their marriage, his ex-wife never worked, she was a stay at home mom, because he had a good job (Class B Machinist) and made enough money working for different oil companies to allow her to stay home and raise their kids. To put it bluntly, his ex-wife is a grade A bitch, a very demanding person, no matter what he bought for her or did for her, it was never good enough. His love for his daughters was the only reason he hung in there for as long as he did, he wanted it to work, for their sake, but it didn't. After a nasty divorce, she was awarded 2 years of alimony on top of the child support he had to pay every month. He gave her his house (he inherited the house) in Shreveport so that his kids wouldn't have to be uprooted from their home and he moved off to Dallas where he has been for the past 20 years.

Years after the divorce, his ex-wife continued to give him problems, she attempted to turn his daughters against him by feeding them lies, She claimed that he cheated on her with multiple women through out their marriage and other BS she could think of. At first, the lies caused friction with his daughters, but they eventually figured out who was telling the truth and who was not. One time, she called child services on him when one of his daughters fell off the swing set in his backyard, skinning up her knee and bruised her leg. His daughter kept telling her mom what actually happened but the ex was determined to make his life miserable. Child services never found any evidence of child neglect or abuse. The situation got so bad that he refused to pick up his kids from thier house when it was time for vistation, they had to meet him at the local police station. All in all she treated him like dirt and any chance she got to go after him for money, that's what she did.

Fast forward to this week. For the past 15 years he lived with his gf outside of Dallas on a really nice spread of land. She was with him when he passed away, they have no kids together. I pulled up to the funeral home along with my wife and walked over to where his gf was standing by the front door of the funeral home. I talked with her for about 20 minutes before heading in to pay respects to my friend. I was inside the little kitchen area getting my wife and I a drink, when his ex-wife along with his daughters walked in and was signing the guestbook. They didn't get far before his gf confronted them. His gf more or less told the ex to gtfo and if she didn't, she would be physically removed. His gf told his daughters that they were welcomed to stay, but their mom had to go. His daughters broke down crying, more words were exchanged between the gf and ex before the funeral director stepped in to breakup the commotion. I was told by his gf that she sent a message via FB to the ex not to show up for his funeral. It took a while for everything to simmer down, in the end his daughters and ex walked out, his daughters were still sobbing as they left. It was a really sad situation.

No pics don't ask.

What would you have done in this situation?