Basing a genealogy on sagas and legend can be a very questionable thing.Be very very careful.
From Wikipedia, the free encyclopedia: Little is known of the historical Harald. The only contemporary sources mentioning him are the two skaldic poems Haraldskvæði and Glymdrápa, by Þorbjörn Hornklofi. The first poem describes life at Harald's court, mentions that he took a Danish wife, and that he won a victory at Hafrsfjord. The second relates a series of battles Harald has won. He is not mentioned in any contemporary foreign sources. His life was described in several of the Kings' sagas, but the first of these were not written until the end of the 12th century, over 250 years after his death. Their accounts of Harald and his life differ on several points, and much of the content is clearly mythological. http://en.wikipedia.org/wiki/Harald_Fairhairhttp://en.wikipedia.org/wiki/Harald_Fairhair
That being said, I'm sure you can find someone who has created and posted a family tree anyway even if based on sketchy and questionable information."Google" search will doubtless find.