Property issue

Hi Sir / Madam,

I'm Karthik. 25 years back my father and his brother bought a home in chennai,  which is regitered under my father's brother name. Now he is claiming that is his properety. But while buying property they both gave equal share of money.

As of now we are still staying in the same property. The property have 4 portions. One is occupied by us, second we are receiving rent and other 2 portions my father's brother collecting rent.

Now he is saying he is going to sell the property and asling us to vacate. Do we can claim our share? Kindly help on this.

Thanks in Advance.