Okay i need to clear some things up simply answer yes or no to these if you know them

Can a vampire turn into a werewolf thus cancelling out the vampire disease?

Can a werewolf turn into a vampire thus cancelling out the werewolf disease?

Is there any way to become a werewolf besides joining the companions?


Thank you

Yes.

No.

Wiki says yes, but I don't know how nor have I seen a way to do so.