Pursuant to Steps Seven through Ten, here's the Cambridge Encyclopaedia of Languages' list of the 55 Indo-European varieties of languages.
Celtic
Welsh
Irish Gaelic
Scottish Gaelic
Manx
Cornish
Germanic
German
Yiddish
Old English
Dutch
Norwegian
Swedish
Danish
Italic
Latin
French
Spanish
Portuguese
Catalan
Albanian
Greek
New Testament
Modern
Baltic
Lithuanian
Latvian
Old Prussian
Slavic
Old Church Slavonic
Russian
Belorussian
Ukrainian
Polish
Czech
Slovack
Macedonian
Serbo-Croat
Bulgarian
Slovene
Armenian
East
West
Iranian
Ossetic
Kurdish
Persian
Baluchi
Pashto
Indo-Aryan
Sanskrit
Pali
Hindi
Panjabi
Sindhi
Kashmiri
Nepali
Gujarati
Marathi
Sinhalese
Assamese
Bengali
Oriya
Romani
