The first link you list works ok, but the second one has a problem, probably because of the "it" at the end which shouldn't be part of the link.
As for the content, personally I think the father and mother entry boxes should always be reserved for the genetic parent and anything else should be entered into the biography. Maybe someday when chimeric children can be produced it will be necessary to switch to multiple fathers or mothers, but now it's just confusing and unnecessary. One can. of course, enter the assumed father and later have to change him for genetic (DNA) reasons, but doing it on purpose is basically just selfishness. (except for protecting young children from emotional termoil)