run in the family, have a complex about, go under the knife, but still

runs in the family

It indicates a shared genetics about a trait such as red hair, blue eyes, freckles ,high blood pressure
When a lot of family members are sharing a certain trait, I can say ‘it runs in the family’.
Cameron said his father’s side have a tendency to lose their mental faculty in early age.
Kristen has liver problem running in her family.

have a complex about

overly worried about something which makes you feel insecure even when it is not necessary.
It could be so stong that might affect their personality.
I could bring about obesession.
It is interesting it means almost the same thing in Korean, except that Koreans use this expression more often.
To be extream, everyone has complex about their nose.

go under the knife

When someone choose to have surgery, usually not in an emergent situation, you can use this expression.
My father went under the knife two years ago because of kidney mass.
The knife means scarpel here.
These days people go under the knife for transplanting hair in their early age when they begin to see receding hairline.

but still

however, do not forget