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by florbnit 287 days ago
> a random family has been sampled, the sample family has two childs, one of them is a girl"

It’s not a random family if it must have at least one girl. If you want to talk about a random family you can only make statements of the kind “one of the children is <gender>” where the gender depend on the specific family or “the family has between 0 and 2 girls”