The Thenardier Crowd
We see the Thenardiers with a lot of guests and fellow criminals, but they actually had five children. Eponine is the only one acknowledged in the musical as being one of them. Did you know that Gavroche is the eldest son of that family? He is the middle child, with two younger brothers who live on the streets with him. (He lives inside an elephant statue outside the Bastille.) If you watch the Neeson/Rush version, these two are part of the storyline. We know that the Thenardiers show up to blackmail Marius, but you may not be aware that the wife died in prison before that in the book. The last of the family moved to America with their never-mentioned daughter and Monsieur Thenardier became a slave trader.