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Just because they're not mentioned doesn't mean they don't exist. By the same logic we should think all side characters don't have a home, since we never see it or are introduced to it. Even for very important side characters we usually don't a get a briefing of what family members they have and such until when we get to see their house (and only if one of the members of the family are there).
The question really boils down to, why don't we get to see all the little sisters, and the reason for that is because it breaks up the narrative and is very much useless information that adds unnecessary complexity to the plot.
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