NURSING ANM AND GNM

Detailed explanation-1: -Your is an adjective that means “relating to or belonging to you.” Yours is a pronoun that means “that which belongs to you.” Yours is also used in letter writing as a closing. Your is less commonly used as a closing in letter writing.

Detailed explanation-2: -This is a perfectly grammatical sentence. Good manners dictate that we mention ourselves last, hence the more polite form you suggest Yours/Your and my native languages have co-existed for hundreds of years, which could of course be Your native language and mine have co-existed for hundreds of years.