Joshua and jeanette are brother and sister who live with their biological parents. they live in a(n) foster family blended family nuclear family extended family

The answer is "nuclear family".

Nuclear family, additionally called elementary family, in human science, a gathering of individuals who are joined by ties of organization and parenthood and comprising of a couple of grown-ups and their socially known kids. Youngsters in a nuclear family might be the couple's biological or espoused posterity.

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