Legal notice received by brother to vacate the ancestral property

We are 5 brothers, my younger brother is operating his business and staying in the residence in our ancestrol property. I bought a shop in his name 16 years back and carrying out my business from the same premise. I bought it out of love from my brother. During division of property it was decided mutually that younger brother would operate from ancestrol property and I would be given the shop in rajkot, But now he is asking my to vacte the premise after 16 years when i asked hm to tran. prop. to my name. He has sent me notice to vacte in 7 days. Please help. I have witness of other 3 brothers of rajkot property being my. but no written agreement. Please help. he is demanding money also from me.