Grammar

Stems:
mein my;
dein your informal singular;
sein his/its;
ihr her/their;
unser our;
euer your informal plural;
Ihr formal your.

First choose the owner, then the ending required by the possessed noun's gender, number and case.

Nominative: mein Vater, meine Mutter, mein Kind, meine Eltern.
Accusative: meinen Vater, meine Mutter, mein Kind, meine Eltern.
Dative: meinem Vater, meiner Mutter, meinem Kind, meinen Eltern.

Other stems follow the same pattern. With euer, forms commonly contract: eure Mutter, euren Vater.

Example

Das ist meine Tasche. Ich suche meinen Schlüssel.

English

That is my bag. I am looking for my key.

Hinglish

Woh mera bag hai. Main apni chaabi dhoondh raha hoon.

A Hindi feminine noun such as chaabi (key) does not make German Schlüssel feminine. German grammatical gender belongs to the German noun.