Which type of family includes same-sex couples?

The correct answer highlights the fact that the category specifically referring to families formed by same-sex couples is directly named. This term distinctly identifies families where both parents are of the same gender, emphasizing that they fulfill the familial role regardless of traditional expectations. This option is straightforward and accurately labels the family structure without needing to be combined or modified with other family types.

In contrast, extended families typically include relatives beyond the nuclear family, such as grandparents and aunts, but do not specifically define the types of couples. A foster family is characterized by temporary care of children by individuals who are not their biological parents and does not inherently relate to the sexual orientation of the caregivers. A blended family refers to a family that includes children from previous relationships of one or both parents, again without reference to the couple's sexual orientation. Thus, the distinction made by the chosen answer is significant in identifying the unique structure of families formed by same-sex couples.