Indo European Language

Indo-European is a language family containing the CelticLanguage, IndicLanguage?, GermanicLanguage, RomanceLanguage, SlavicLanguage, and GreekLanguage? (among other) subfamilies.

The same tree is on http://www.wikipedia.com/wiki/IndoEuropean, for anyone interested, but more complete. The best IE language resource is http://www.geocities.com/indoeurop/