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Iranian and Balto-Slavic languages form another

ARe you sure? Ancient Irani (Avestan) related to Slavic and Baltic languages)? But Avestan is very similar to Sanskrit, almost brother dialects in a way. I don't think the Slavic language is so closely related to these two more highly evolved Aryanic languages.

of course in a broader sense they are related, but on what basis do you say that the Slavic language is comparatively closer to Sanskrit-Avestan than German or Latin? I'd think the opposite was true.

Or maybe you're basing it on geography

Linguists in the past have divided the Indo-European family of languages into two large sub-groups: the Centum Languages and the Satem Languages. These names come from the words used for "hundred" in each group, but the similarities are supposed based on many other factors as well.

The Italic, Germanic, Gallic, and Greek Languages, as well as Tocharian A and B are believed to be Centum languages, while the Balto-Slavic and Iranian Languages and Sanskrit are Satem Languages.

Some earlier Indo-European Languages like Hittie, don't fall into either group. Or so I was told in my College Classical Greek classes.