quick question

So my daughter's father is taking her to FL this weekend -- in particular Fort Lauderdale which is where my parents live in the winter and he knows it. He also knows they despise him, he isn't too fond of them -- yet, he wrote them tonight offering to take our daughter to see them -- this was after several awful exchanges with his lawyer and my lawyer today. Anyone have a clue what he's manipulating. We have a GAL beginning an investigation soon. He asked for more time this weekend and next weekend on top of his vacation and we said no. He said he wanted to pick her up earlier on Sunday for her trip than I want to bring her. His lawyer said to mine that they will bring this up to the GAL and will demonstrate that I am being retaliatory for him bringing her home so late at night on Wednesday. Anyone that's following me know he is landing into Logan at 10 pm and made these arrangements without any discussion with me at all -- leading us to our most recent spiral down. So why, in the mist of real heat is he offering to bring our daughter to my parents? What is he manipulating. Is he trying to prove to the GAL that he is bigger than me and acting in our daughter's best interest?