It's already been stated, many times over, that Aldmeris is the root language of Tamrielic. I think that's pretty clear from the afore-mentioned sources.
What I don't understand is... well...
Latin?! A root language for English? That's news to me. I always thought it was Germanic in origin, since the phonics, grammar, and syntax are similar. They're absolutely nothing like a Latin-based language. English has many Latin words, but it has many words from many languages, all of which have been properly anglicanized. AFIK English (or New English) is a more evolved version of Old English which is, in turn, a bastardization of a, now-lost, Germanic dialect.
English is more French than it is German, and its grammar is closer to French than it is German. If you do not even think you speak a word of French, if you can speak English, you already have a French vocabulary of over 2000 words. Example: almost every word ending in -able, -ent, -ant, or -ion is exactly the same in French. 75% of the Anglo-Norman words imported in the 12th century are still in use today. French is normally taught earlier in British schools than German because it is considered easier to learn, given the similarities between the languages. Many private schools teach Latin as well, since so many languages (including English) are founded on Latin that to learn Latin is to unlock the key to learning all
romantic languages e.g. English, French, Spanish, Italian. If you do not believe that English is a romantic language like French, Spanish and Italian, that is your prerogative - but this statement is taught as fact in the English national curriculum, so it's an awful lot of schoolteachers you are arguing with. I was taught that English is a "Latin-derived" language, in school, when I was 10 years old, and no other teacher contradicted this.
The Germanic aspects of English date back to Anglo-Saxon times and are certainly evident in Chaucer's English of the 12th century - however, due to the invasion of William the Conquerer in 1066, the French language became a dominant cultural influence until "modern English" was developed in the 16th century. This is because the Normans were the aristocracy, so were the ones with the education.
You may possibly argue that
American English has aspects of German grammar because you use phrases like "Wanna go eat with me?" which would be incorrect grammar in British English ("go eat" would never be used). British English also has a preference for the -ing form in the present tense.
Because a "classical education" in medieval and Renaissance times involved studying in Latin and Greek, many thousands of Latin and Greek words entered the language. (see http://en.wikipedia.org/wiki/Greek_and_Latin_roots_in_English)
So English is
predominantly based on old versions of French, German, Latin and Greek (in roughly that order) with a surprising number of Indian words (such as "shampoo") being introduced later on.
It has no one single origin.
Drawing this back on topic, I may be misremembering, but I seem to recall that Elven words borrow from each other in this manner, with occupations and integrations having a huge impact on language development in Tamriel.