It is a wise child that knows its own father

It is a wise child that knows its own father.

Prov. You can never have certain proof that a certain man is your father. (Implies that the child in question might be illegitimate.) It is a wise child that knows its own father, but Emily is so much like her dad that there's very little uncertainty.
See also: child, father, know, own, that, wise
Idioms browser ?