So much for the Romance languages; how about the Finnish - chinese - Bantu?
I posted about this a while back.
There is a well-developed theory of language evolution. A lot of very clever people have been working on it for a very long time.
http://wiki.cotch.net/index.php/Linguistic_Evolution
Finnish and Hungarian share a common ancestor (and maybe Estonian or Latvian, I don't remember.)
Bantu is a group of languages sharing a common ancestor.
I haven't read much about the Chinese.
Comrie's book, "The World's Major Languages" is an older reference that's pretty good.