I have never seen a serious linguist claiming that Armenian didn't belong to the IE family (it is a satem language). Where did you read that? I strongly recommend chapter 16, Armenian, in Fortson 2010 textbook , esp. parts "The Introduction" and "From PIE to Classical Armenian", pp. 382-393. It's a good idea to read it thoroughly! Also, have a look at https://dictionaries.brillonline.com/armenian#introTab (Tab "Aspects of Historical Grammar"); this is a chapter from an excellent etymological dictionary of the Armenian lexicon inherited from the IE). Some of the claims you made are in fact incorrect (e.g. words for relatives ; also see Basic Words from Wikipedia, posted by Daniel Briggs): Arm. mayr ‘mother’ Arm. hayr ‘father’ Arm. khoyr ‘sister’ Arm. eġbayr 'brother' Arm. dowstr 'daughter' Arm. taygr 'brother-in-law' (cf. Sanskrit devar-) Arm. nu 'daughter-in-law' (cf. Greek nuos, Old Chu

ancestor known as Proto-Indo-European. A language family is usually said to contain at least two languages, although language isolates — languages that are A language family is a group of languages related through descent from a common ancestor, called the proto-language of that family. The term family is a metaphor borrowed from biology, with the tree model used in historical linguistics analogous to a family tree, or to phylogenetic trees of taxa used in evolutionary taxonomy. Linguists thus describe the daughter languages within a language family Most of the world's languages are known to be related to others. Those that have no known relatives (or for which family relationships are only tentatively proposed) are called language isolates, essentially language families consisting of a single language. There are an estimated 129 language isolates known today. An example is Basque. In general, it is assumed that language isolates have relatives or had relatives at some point in their history but at a time depth too great for linguistic comparison to recover them. A language isolate is classified based on the fact that enough is known about the isolate to compare it genetically to other languages but no common ancestry or relationship is found with any other known language. A language isolated in its own branch within a family, such as Albanian and Armenian within Indo-European, is often also called an isolate, but the meaning of the word "isolate" in such cases is usually clarified with a modifier. For instance, Albanian and Armenian may be referred to as an "Indo-European isolate". By contrast, so far as is known, the Basque language is an absolute isolate: it has not been shown to be related to any other modern language despite numerous attempts. A language may be said to be an isolate currently but not historically if related but now extinct relatives are attested. The Aquitanian language, spoken in Roman times, may have been an ancestor of Basque, but it could also have been a sister language to the ancestor of Basque. In the latter case, Basque and Aquitanian would form a small family together. Ancestors are not considered to be distinct members of a family.

Material index and concordance to the comparative grammar of the languages: Sanskrit, Astrian, Armenian, Greek, Latin, Lithuanian, Old Slavic, Gothic and German, by Franz Bopp (1791-1867) - German linguist and Sanskrit researcher, considered a precursor of comparative linguistics in the field of Indogermanic languages. Study - Carl Arendt. The title page shows the manuscript protagonist Neumann - Elbląg bibliophile and historian.

Material index and concordance to the comparative grammar of the languages: Sanskrit, Astrian, Armenian, Greek, Latin, Lithuanian, Old Slavic, Gothic and German, by Franz Bopp (1791-1867) - German linguist and Sanskrit researcher, considered a precursor of comparative linguistics in the field of Indogermanic languages. Study - Carl Arendt. The title page shows the manuscript protagonist Neumann - Elbląg bibliophile and historian.