Just a point of order: step-siblings do not share biological parents. Step-siblings are the product of two single-with-children adults marrying and combining th

Just a point of order: step-siblings do not share biological parents. Step-siblings are the product of two single-with-children adults marrying and combining their households. Half-siblings, on the other hand, have one shared biological parent. Half-siblings are the result of two adults, at least one of which already has children, having children together.