Who are the parents of a child's own parents?

The correct answer is grandparents. Grandparents are defined as the parents of a child's parents, which means they are one generation above the child's parents in the family lineage. This direct relationship makes it clear that grandparents play a vital role in the familial structure, often providing support, guidance, and sometimes caregiving as families navigate through various stages of life.

The other options represent different family relationships but do not fulfill the criteria specified in the question. Parents are the immediate guardians of the child, aunts and uncles are siblings of the child's parents, and great-grandparents are the parents of the child's grandparents, placing them two generations away from the child rather than one. This highlights the specific lineage connection that makes grandparents the correct choice.