Linked from
The 17 pages that link to Indo-Iranian languages, each with the reason it gives.
Persian languageNarrower topic: Persian belongs to this branch through its Iranian subgroup.
RigvedaNarrower topic: Rigvedic Sanskrit shares inherited features with ancient Iranian languages.
Indo-Aryan languagesNarrower topic: This is the parent branch of Indo-Aryan.
Iranian languagesNarrower topic: Iranian languages are one of its principal branches.
Kurdish languageNarrower topic: This is the larger historical family that includes Kurdish.
Iranian peoplesNarrower topic: Iranian languages belong to this larger language family.
AvestanNarrower topic: Avestan belongs to this branch, sharing deep ancestry with Vedic Sanskrit.
SarmatiansRelated: Sarmatian speech belonged to the Iranian branch of this language family.
Bartholomae's lawNarrower topic: This is the language group in which the sound change operates.
KurmanjiNarrower topic: Kurmanji belongs to the Iranian branch within this larger language family.
Ruki sound lawNarrower topic: This branch preserves especially clear evidence for the change.