My grand dad have land and the house and property in India. My Grand dad has pas

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My grand dad have land and the house and property in India. My Grand dad has past away few years back. Also My dad past away in 2010 i.e. after my Grand father's death. My grand father has five sisters and five brothers. My dad and my dad's younger sister past away.

My mum is still live.

Q.1 How much right I & my brother have have for my Grand dad's property and land from my Dad's Share? Q.2 What is power of Attorney means? Q.3 Does my uncle require my power of attorney to him to give my dad's share on to my mum's name?