wow, my dad continues to surprise me

Ok very interesting thing happened. I was talking to my mom about going somewhere on Sunday. Then she says, that dad said that he doesn't want to take me with him, because its to much of an hastle.
I couldn't believe what I was hearing! This was the first time he's ever said something like that. I was very much taken aback. I was also abit hurt by this. How could he say something like that. Then I told my mom how I thought he was changing for the worse. She actually agreed with me.
She said that he's been arguing with her over the stupidest reason, and fighting alot. Something is wrong with him, but I don't have a clue what. He would never said that about me before, and why should he start now.
God! These days, I could never figure him out.