While I knew my children were really good at triangulating and splitting people against each other, including my wife and I, I hadn't realized how deep this ability could interrupt my wife and I. Looking back, it almost killed our marriage, literally. I am not sure exactly what I would have done differently, but I would definitely have worked to prevent this had I realized the serious danger.
I thought my wife and I were fairly solid, but it turns out she had been turned very much against me. This is not a general marriage blog, so I won't go into the full details, but she had almost been swayed and I believe ended up blaming me for many things that really weren't my fault.
Our society really needs to figure out how to deal with this. Many children are stuck in the system, but adopting them without firm support for the many troubles that are almost guaranteed is quite dangerous.