False claims of decendacy can live long, as traditions. ”A family secret”. Of course to be excluded in Geni but still of interest and can be mentioned and explained using the best sources. Look up the last Duke of Courland who had two children with his mistress, recognised but never official, three daughters with the duchess he married and then one last daughter with her, officially recognised but openly known as not his biological! All descendants are included in Geni also the descendants of the youngest, because of her equal right to inheritance, her title as princess and her influence on family affairs.
The Geni policy is not uncomplicated always. Correct information based on the best sources must be the target.