Like father like son.

A son is said to resemble his father in character, habits, abilities, or behavior. The saying compares a father and son and presents the son as following a recognizable parental pattern.

It may be approving when the shared quality is admired, or critical when the father’s faults seem repeated in the son. It draws a comparison rather than proving resemblance is inevitable, and should not be used to assume a son must share his father’s character or choices.

Use it when a boy or man displays a trait, talent, preference, or conduct associated with his father. It specifically compares father and son, not family resemblance generally. Depending on the example, it can be affectionate praise, dry observation, or a rebuke; avoid using it as a fixed judgment.