Google shares are going to be in many funds that are bought and sold in large chunks to investors. I doubt any family as rich as the Heinikens would not own shares in Google. Do they own a large chunk? Probably not. If they owned over 5% (which would be billions of dollars worth) they would have to file a specific form with the SEC and their ownership would be public knowledge.
Must have been a dull article I read then. It said they owned 50 %. I found it far fetched at the time