strange characters
I didn't understand the part about the ex-husband. Why did he stalk the house in the beginning, and who was he fighting with inside the house? Didn't he get a chance to explain to the police any suspicions he had concerning his family? And what was his purpose in going back to the house again later (only to be apparently driven away in a bloody car)? If the mother was so concerned about keeping her family together, why did she divorce her husband?
The neighbor father was also annoying in his stupid insistence on overlooking the strange behavior of the people next door.
In order for Titus to be prescribed all those anti-psychotic medications, he had to be seeing psychiatrists, who would have picked up on his weird and dangerous behavior. That he had killed 30 people without being suspected was unbelievable.