Need advice on child dispute

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My husband and I have been married for just over a year now. I have a 4 and a 6 year old from a previous relationship and he has an almost 12 year old son from his previous marriage. When we first met, him and his son had a fantastic relationship. My husband got his son every other weekend like clockwork. In February of 2008, my hubby and I moved into a home together. I didn't move into his place and he didn't move into mine. We got a home that was ours. His son seemed over the moon! He loved his new room, the yard, and the fact we could get a dog. We had some problems here and there with his ex-wife, but nothing terrible. As I have learned in the past though, I kept notes on the little things. She wouldn't send his nedications for the weekend, she would send a cell phone with him and call him at least 10 times on the weekend. Then in July of 08, my hubby was able to get his son for his 5 weeks in the summer as allowed. This was the first time since they divorced in 01 due to not having a reliable sitter for his son. I made arrangements to have him go with my children to their sitter. As soon as his ex found out that he would be getting him in the summer, she made plans for him which eliminated a week and a half of our time. My husband accepted it because he knew he would still get him for a few weeks which he has thrilled to death about. The summer visit went with a few problems, but mostly well. She threw up issues here and there, but we just accepted them to keep the peace. In July of 08, my husband and I let his son know that we had decided to get married. He was happy about the whole thing. Until he told his mother. Over the next few months after the summer visit, his son became more withdrawn. He would no longer talk to or play with my kids, told his dad he didn't love him and didn't want to be here, and started to referring to my husband by his first name. Ever since he was four he has been made to call his step-father "dad" but continued to call my husband dad. Now he only refers to his step-father as dad. Two weeks before our wedding in October of 08, his ex-wife call CPS on my husband. My children were grilled and made to take off their clothes to prove nothing was going on. Our problem was trying to figure out why his son would say we were hurting him or my kids. Everything was found to be false and dropped. We acted like nothing happend around his son. Then his son ran away 2 weekends later while at our home. We found him quickly, but found out his mother had paid him to do it. Then the final straw was that she got a protective order against my husband that stopped visitation. A lot more little jabs were thrown by her, but that's the main bulk of it. My husband and I both got laid off from the same company in December 08 and are both still looking for work. She knows we can't afford all the legal action she is trying to take against us. She is hoping we will give up because we can't afford it. After looking it up, we have a clear case of parental alienation syndrome going on. We go to court on the 18th for the hearing. My question is, how do we prove it is that syndrome, even though we have all the proof that nothing is happening and it is just a vindictive ex trying to keep her ex from their son?