Sentence is:
うん俺の嫌いな杉木さんとこの一人息子な
Translation is:
Yup. The only son of the Sugiki I hate.
What does とこの do here?
Sentence is:
うん俺の嫌いな杉木さんとこの一人息子な
Translation is:
Yup. The only son of the Sugiki I hate.
What does とこの do here?
杉木さんとこの is semantically the same as 杉木さんのところの ("of Sugiki's family").