Hi Kyle. This is a long-standing "feature" of the site software that has been discussed many times in G2G, not a defect. My understanding is that the data base does not keep track of sibling relationships directly -- siblings are only linked through a parent. When you attempt to link two siblings who do not have parents shown, the software creates an "Unknown Father" profile to make the association. You are the manager of the unknown profile and can turn it into the real father profile when the father becomes known.