Hindi has two main idioms for expressing possession:
Of course, possessive adjectives also express possession too.
के पास is used for moveable impersonal objects – things like keys, books, tea, etc. It is generally not used for people, except in the case of servants.
आप के पास चाबी है क्या – “Do you have the key?”
तुम्हारे पास चाय है क्या – “Do you have tea?”
का (or possessive pronouns) is used for unmoveable objects (house) or for people.
मेरे दो बेटे हैं – “I have two sons”