*[httphttps://sourceforge.net/p/gramps/mailman/gramps-devel/thread/CAAq8ydvP76kBkFGKS0q11j0F_K3ZOpCgWRisrR1N3S-eyWGjgQ%40mail.1791082.n4.nabblegmail.com/bio-half-step-siblings-in-NarrativeWeb-td4381598.html #msg28823931 2012 discussion] (the proposed work cannot be completed) *[httphttps://sourceforge.net/p/gramps/mailman/gramps-devel/thread/235319.40517.1791082qm%40web24103.n4mail.nabbleird.yahoo.com/Half-siblings-in-Narrative-Web-td2304027.html #msg25836057 2010 discussion]*[httphttps://sourceforge.net/p/gramps/mailman/gramps-devel/thread/bcafe8290908280639y4d5016afo9ba8ae63ebf9a515%40mail.1791082.n4.nabblegmail.com/Definition-of-step-siblings-td1805431.html #msg23422694 2009 discussion]