Question

your brother tied his shoes. is your a noun?

Answer 1

Given sentence
Your brother tied his shoes
'Your' is used instead of the name of a person. So, the word 'your' is a pronoun.
Pronouns are the words which are used in the place of noun for addressing the subject or object.
Ex: I went to wash it.
'I' is a pronoun which addressed the subject.
'it' is a pronoun which addressed the object.

Answer 2

Your brother tied his shoe laces.

This sentence can also be written as

Sumit’s brother tied his shoe laces.

Or

Annanya’s brother tied his shoe laces.

 

So, ‘your’ is basically used in place of a name. A word that is used in place of a name is called a pronoun. Hence, ‘your’ is a pronoun and not a noun.