A descendant of Mist still holds Ike as an ancestor. The direct lineage of Priam is irrelevant however as he is clearly a fraud. Yes Ike did throw his sword, but to take advantage of the laws of physics to increase his own acceleration so he may strike with greater force(Ike is of course aware of physics, despite the lack of education in Tellius, due to his infinite wisdom). Priam uses his blade as a projectile. That is the action of an idiot and a fraud. What would you sooner believe, that some puny god could make a magic sword that shoots fire, or that Ike, in all his manly girth, can simply will flames in to existence?