JLPT N1
～が/も～なら、～も～だ
like father like son; both A and B are (equally bad/similar)
Structure / Usage
A + が/も + B + なら、C + も + D + だ
Example Sentences
親も親なら、子も子だ。
Like parent, like child. (Both are equally bad.)
言う方も言う方なら、聞く方も聞く方だ。
The one who says it is bad, but the one who listens is just as bad.