Bio Parents vs. Guardians
My great-grandfather, Henry Clay Rogers (LTHX-HLS), was orphaned at a young age.
The FamilySearch tree correctly reflects both his biological parents, Daniel Rodgers (2ZS7-YNM) and Mary Balding (G724-NV7), as well as the couple who became his guardians: Duren V Rogers (LCZH-Q2N), Daniel's first cousin, and his wife, Mary's sister, Susan Balding (GHKQ-WL5).
The problem is that when FamilySearch calculates relationships or sends notices about "your great-great-grandparents," Duren and Susan are identified as my direct ancestors, despite the fact that their relationship to my great-grandfather is clearly recorded as "guardinaship," not biological. Sounds to me like an interesting problem for a programmer. Or am I missing something?