Answer:
Because of high fertility and the presence of relatives beyond the nuclear family, households are large--six to eight people are common. The Nicaraguan household is typically augmented by the presence of a grandparent, an aunt or uncle, an orphaned relative, a poor godchild, or a daughter with children of her own.
Explanation:
6-8 people
Vivir en el centro de una ciudad es peor porque hay mucha tráfico en las calles, en cambio vivir en un barrio residencial es mejor porque no hay tanta gente.
(Assuming the myth is referring to the United States)
The myth comes from people who don't like immigrants and who don't want immigrants to come to their country.
A person who might be xenophobic or someone who already lives in the country that the immigrants are coming from. For example an American who doesn't want someone from Latin America coming over. They may benefit from this myth to victimize themselves that the country is being "overrun by illegals".
This myth is untrue because there are many legal immigrants that arrive here legally.