Originally Posted by Piak-vOne more question, please.
I have this sentence to ask you, "I" is the subject of the sentence while "who" is the relative pronounce of "I", the question is that "who" should be used with "is" or not or should it be "am" or somethingelse?
"As I am herein, in the status of being brother-in-law of Miss. Mayuree, who is a younger sister of my wife."
First of all, it is not a sentence. It is two clauses, one beginning with the
subordinating conjunction "as" and the other beginning with "who". Second, in this case "who" is referring to Miss Mayuree, not to "I". One can deduce that from the language. The speaker cannot be the younger sister of his wife.
Had the relative pronoun "who" been referring to "I", there would be a difference of opinion about the verb form that should follow "who". Some grammarians argue that "who" should reflect the number and person of its antecedent, and would choose "who am". Others argue that "who" is always third person and should only reflect the number of the antecedent. This group would choose "who is".
Thank you and best regards,