"Aroomofthehouse"

because in Turkish both the possessor (ev) and the possessed thing (oda) require suffixes

We use genitive case (-In) in order to say X of Y or Y's X as a possession.

-den/-dan (Ablative case) never means of as a possessive/genitive construction. It basically means from, through, than.

It also means out of. So, Let's go out of here - Buradan çıkalım. or I did it out of fear. - Korkudan yaptım.

Sometimes it can mean of, but there is no certain rule of this.

I am bored of you. - Senden sıkıldım.
I am scared of you. - Senden korkuyorum.

So -den/-dan doesn't equal to of.

because "of" also indicates possession just like 's in house's ???

"bir oda evde" doesn't make much sense, but even if it did, it would only indicate location

Because of the way Turkish does compound nouns. Ev odası would mean something like ''house room'' -- a general category for a particular type of room. If you want to say ''the house's room'' -- the example here -- you need the genitive suffix on the first noun as well as the second.

why would it be evinin?the root word is ev and you add possessive suffix -in od the word.

"A room of the house" Translation: Evin bir odası.

The literal translation English question answer is correct & mirrors the Turkish answer. "Evin odası." - A room of the house. I did not use "bir" in my answer. English grammar: "The," "a" & "an" equates to "bir" in Turkish. Honestly, there is no Turkish regional dialect connection as far as I know.

English language grammar. The words, “the”, “a” & “an” are called “articles” which are a type of determiner. Change “a” to “an” if the next word starts with a vowel. English language vowels: (Aa, Ee, Ii, Oo & Uu)

Teşekkürler.

My boss is from Aberdeen & she will ring me & ask: "Please can I have a wee pair of steps: Translation - Please can I have the three step, Aluminium ladder." This may baffle most native Turks.

Teşekkürler.