The town______my father grew up in is not far fro

这是定语从句

先行词是the

town，它在从句中的成分是in这个介词的宾语

是宾语所以用which(并且不是指代人)

如果原句中没有in

那么可以用where

变为The

town

where

my

father

grew

up

is

not

far

from

here.

where等于

in

which