Adjective
cognatic (not comparable)
Of or relating to a mode of descent calculated from an ancestor or ancestress through any combination of male and female links, or a system of bilateral kinship where relations are traced through both father and mother.
In 1980, Sweden became the first monarchy to declare equal primogeniture, absolute primogeniture or full cognatic primogeniture, meaning that the eldest child of the monarch, whether female or male, ascends to the throne. Source: Internet
However, King Frederick I of Prussia also claimed the Principality as the senior cognatic heir, his mother Louise Henriette being Albertine Agnes's older sister. Source: Internet