My uncle died at age 48 on 12/12/2015, He was not married, my grandfather and grandmother died way b

My uncle died at age 48 on 12/12/2015, He was not married, my grandfather and grandmother died way back. At present only my father is alive along with my another uncle two son, my father also have three sisters, all married, After my uncle's death, my father along with my cousin brother submitted a written application in tehsil rajatalab, varanasi, where lekhpal submitted the report in our favour, just after this my bua (father sisters) Claim there right over my uncle's property with unregistered will dated 8/01/2004 in different court and registered their name in khatauni and it was not in our knowledge, since than the land is disputed, My question is that does they hae right to claim the land with unregistered will, Does my father and my cousin are natural heir of that property. Meanwhile two of my bua's sold that land, is it legal, can i lodge FIR against them,