Linked from
The 76 pages that link to Indo-European languages, each with the reason it gives.
Gothic languageNarrower topic: Gothic belongs to this family through its Germanic ancestry.
Anatolian languagesNarrower topic: Anatolian is one of its earliest-attested branches.
Nostratic languagesRelated: Nostratic proposals commonly place Indo-European within the macrofamily.
Colin RenfrewNarrower topic: Renfrew’s origin theory addresses how this language family spread.
Indo-Aryan peoplesNarrower topic: Indo-Aryan languages form one branch of this wider family.
Osthoff's lawNarrower topic: The law is reported in Greek and other branches of this family.