Hindu succession questions

I am from a Hindu joint-family. My father is the eldest and he has two brothers and three sisters. In 2015, my middle-uncle died and in 2016, my youngest uncle died. I was bought up in my youngest uncle’s house since my childhood. My youngest uncle was a bachelor and has no class I heirs. My middle-uncle left my aunt, and my cousin, while dying. My father is alive. Well before his death, my youngest-uncle made a will on a plain paper, gifted me his earned residence & a plot; donated his ancestral properties for our family-deities. He also had nominated me in all his banks & LICs etc. He gave it in my hands for execution in later-days. Also two of my parental aunts support my claim openly on his earned residence, as it was clearly told by my late uncle to everybody in several occasions. But another parental aunt says nothing. But my aunt (i.e. widow of my deceased middle uncle) has started searching for buyers to sell the house of my youngest uncle. I want to donate the money that is in his bank accounts in various social works – as written in his paper. In this situation, my questions are – 1. Can this paper-will be deemed as his legal last wishes in the eyes of law? 2. If my two parental aunts support my claim on this house, shall law approve my sole rights on this house? And use his ancestral properties as per his last wish? 3. And how can I get this house in my name? 4. Can I start donating his money to organisations, as per his last wish? Can anyone stop me in drawing money from banks for this donation? 5. Can my aunt (i.e. widow of my middle-uncle) & his son sell any portion of his property? 6. Can I donate some money (of his) to these relatives (they are not any social organizations, of course)?