It's not a mainstream position in linguistics that Sanskrit is a direct ancestor language of Latin. The overwhelmingly most popular theory is that both are ultimately descended from different branches of proto-European. Latin is from th centum branch and Sanskrit is from the satem branch (which includes Proto-Slavic as well). See http://en.wikipedia.org/wiki/Centum-Satem_isogloss
The blog you cite shows serious signs of crackpotterry, as do its comments.
Agreed. Also note that the (Latin) Centum (pronounced Ken-tum) form has to be overall an older form than Satam due to the missing consonants and palatization noted in the latter.
The current thinking as far as I can tell is that Indo-Iranian (basically the ancestor of Sanscrit and Avestan) was the latest branch to break off of common Indo-European, though I think these models always oversimplify.
The most archaic attested Indo-European language is actually Hittite, possibly followed by Tocharian.
The blog you cite shows serious signs of crackpotterry, as do its comments.