Heavy bullshit. Extremely similar languages - yes. Same - no. And no - Croats don't have serbian ancestors...that's just some more of world famous serbian propaganda all over again.

As for Google language tool - that's correct - it doesn't really recognize subtle differences. It often offers me suggestion that something is in "bosnian" when it's in croatian and vice versa. Same goes with serbian... So ,results here are definitively misleading.