distribution of property

my father got all the property and everything on his own... he had four children two sons and two daughters.... one daughter dies and left with one daughter... her husband might have married again... i m living in government alloted accomodation and brother in his own property in delhi assisted mainly by father... mother also expired long back... i m still living in govt accomodation alloted by my office... the property is lying vacant... father did a will in 2011 and distributed property amosnst me and brother... the will was duly registered.... after some days, he sold a part of the property from my side to the third party... after some time in 2012, he gifted all the property to me ... the gift deed was duly regisered and stamp duty was also properly been paid by me. the mutation of the property was also been dome in my favour in 2012 itself and i m paying property tax on whole of the property.... there was no mention of will in the gift deed or sale deed to the third party.... my father expired in the year 2014.... after his demise... brother started fighting with me directly for sharing the property and through relatives.... sir, please tell me legal status of the property.... can i sale it ...can brother do something legally to share the property....