See also:
https://www.academia.edu/38379849/Genetic_genealogy_for_the_study_of_Puerto_Rican_Spanish_and_Portuguese_family_history_lessons_from_the_Sotomayor_Colón_and_Pereira_families
https://www.qualifiedgenealogists.org/ojs/index.php/JGFH/article/view/62