this might make me sound like a total noob but can i ask anyway.

i have heard a lot from my friends about the story line, i have heard that cloud and zack were clones of sephiroth, i have heard that sephiroth has cloned himself, i hav heard that sephiroth is a clone of cloud.

please will someone clear this all up for me and tell me what really happened. is cloud a clone? does sephiroth have clones?

plz someone help (sorry for my noobishness)