Oh yeah, someone enlighten me as to how he finds out he has children?

Obviously at first he thinks he killed Padme and the baby (cause he dun know twins)

How does he find out Luke is his kid? And doesn't he then think, 'wait, I must not have killed Padme. Emporer you lied to me man'

How does he know?

I apologise if there is something obvious I don't know. I just like these movies, I'm not massively way into the finer details.