Internal and external conflict in the curious incident of the dog in the nighttime, how chris is struggling to be independent

The external conflict that Chris experiences is his father's anger toward Chris' will to investigate the mureder of Wellington, while the internal conflict is Chris' ability to cope with the loss.
The murder of Wellington make Chris questioned the true nature of his father and somehow influence him to get away and become independent. His first step is to go to london and try to find his mother