
Uncle: your father is married to my sister so I am your uncle.
Nephew: uncle your the son of my stepmother.
( So he is the nephews stepbrother) but you are also my uncle.
So the father married his stepdaughter. Woah!
Woah!

Their not blood related at all their only connected by marriage I don't know how you got mixed up they made it very clear the "nephew " doesn't like the stepmother most likely because shes 18 and probably only 1 to 2 year older then he is which is understandable his father is obviously a cradle robber
GG nice manga.