I have disconnected Sveinn from his father Eric Ragnarsson
The website referenced in his About states that it's sources are LDS and Ancestry, which for this part of the tree is the same as saying you have no sources at all.
Eric Ragnarsson's claim to fame is that his death triggered a war. Neither of the sagas that mention him say anything about a wife or children. In Saxo Erik is described as being too young to bear arms and then not mentioned again.