I am confused how this all makes sense. Biologically, which does not matter as much as who actually raises you: Anakin Skywalker/Darth Vader is Luke’s father, The father who actually raises Luke was his uncle Owen.

So in that sense Luke does in fact have: A biological & BAD father- Anakin Skywalker/Darth Vader & A real father who raised Luke in Uncle Owen.

And in a roundabout, indirect sense, Darth Vader did kill Uncle Owen. He just might not even know it…