They have an au pair living in.

他们有个换工姑娘住在家里。

《牛津词典》

In the aftermath of the earthquake, the typical Haitian family living in Port au Prince spends 40% of its income on cooking charcoal.

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It hasn't yet taken hold in the capital Port-au-Prince, where it could spread rapidly because of the crowded living conditions.

BBC: Tropical Storm Tomas: Tense evacuations in Haiti