The curious incident of the dog in the night-time 2

I thought it was messed up how this whole time Christopher thought his mother was dead, but really she was living in London with Mr. Shears. I think it was messed up that that Christopher's father hid those letters from him, while his mother was waiting for a response. Also, I was kind of surprised that Christopher's father had killed Wellington. I didn't really think that he was the one that did it.