Read my other comments for a more detailed explanation, but the tl;dr of the matter is that while they are both Indo-European languages, each is from a vastly different branch family of the Indo-European language family. The Hellenic and Romance branch families for Greek and Latin respectively.
Technically they are related, but technically if you go far back enough I am related to you too, however any sensible person would never make the claim that you and I are related simply because we share a common ancestor somewhere along our history.
Edit: my other comments also have sources, but I don’t want to repeat myself once more, so I wont put them here as well. :)