Ela Filippone has written:

'The fingers and their names in the Iranian languages' -- subject(s): Iranian languages, Fingers, Terminology, Lexicography

They are Iranian languages within the Indo-Iranian branch of the Indo-European language family.

Louis H. Gray has written:

'Mythology of All Races'

'Indo-Iranian phonology with special reference to the middle and new Indo-Iranian languages' -- subject(s): Phonology, Indo-Iranian languages

'Subandhu's Vasavadatta'

Yes. Persian is an Iranian language within the Indo-Iranian branch of the Indo-European languages

Persian Language, also known as Farsi, is the most widely spoken member of the Iranian branch of the Indo-Iranian languages