Suzanne's two biological sons belong to her ________.

The correct answer is that Suzanne's two biological sons belong to her family of procreation. This concept refers to the family unit that is founded through having children, either biologically or through adoption. In this case, since Suzanne has two biological sons, they are part of the family that she has created or procreated.

The term "family of orientation" refers to the family into which an individual is born or raised, which would be Suzanne's own parents and siblings. "Extended family" encompasses a broader network that includes not just parents and children but also other relatives such as grandparents, aunts, uncles, and cousins. "Family of choice" refers to individuals that one considers family despite not being related by blood or law, often formed through close friendships or community ties. Therefore, the family of procreation is the most fitting term for Suzanne's biological sons.