How many people can live in a 2 bedroom trailer?

There are six people living in a 2 bedroom trailer. The grandparents have one room, their son and one granddaughter sleep on the couches in the living room and their other granddaughter shares the other room with her 2 month old son.
Location is Bureau County, Malden Illinos
Update: I'm not a nosy neighbor either, I'm family to them and I'm just trying to make sure that they're not going to get introuble.
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