Same proverb as '貧乏人の子沢山' meaning that poor households tend to have many children.
昔の小説には『貧乏子沢山』という描写がよく出てくる。
Old novels often contain descriptions like 'poor families with many children.'
彼の冗談は『貧乏子沢山』ということわざをもじったものだった。
His joke was a play on the proverb '貧乏子沢山.'