1
general::
A person who closely resembles a parent, as in Like her mother, Karen has very little patience? a chip off the old block. This term, with its analogy to a chip of stone or wood that closely resembles the larger block it was cut from, dates from ancient times (Theocritus, Idyls, c. 270 B.C.). In English it was already a proverb by the 17th century, then often put as chip of the old block.
American Heritage Idioms
2
general::
Phrase(s): a chip off the old block
Fig. a person (usually a male) who behaves in the same way as his father or resembles his father. • John looks like his father—a real chip off the old block. • Bill Jones, Jr., is a chip off the old block. He’s a banker just like his father.
McGrawhill's American Idioms And Phrasal Verbs