1. It is permanently forbidden, due to kinship, to marry: a. Ascendants, even if they ascend. b. Descendants, even if they descend. c. The descendants of the parents, even if they descend. d. The first layer of the descendants of grandfathers or grandmothers. 2. It is forbidden for a person to marry his/her descendant from adultery, even if they descend.
Interpretation and application must be checked against the official text and current version.