HUF PROPERTY PORTITION

Only 3 members in my family. 1.5 acre is in my brother name purchased by my father and 2 acres in my father name purchased by me & my brother. Out of 6 acres of ancetral property 2.5 acres in my name and 3.5 acres in my father name. No proprty is registered only having patta/pass book. They are not having no other income except income from ancetral property. 1.We made partion in 2014. In this i got 4 acres and my brother got 5.5 acres and my father did not get any share. again we partioned in 2015. In this i got 3.5 acre my brother 3.5 and my father got 2.5 acre and i and my brother gave 1 lakh each to my father. Second agreement papers stolen by my brother. And he is saying 1st agreement stands good.But iam having witness that second agreement is made. 1. Whether 1st agreement stands good. 2. Whether that 1.5 acre which is in my brother name is joint property and i get share . As all properties combined and used. 3. Both agreements were not registered. 4. Can i approach court that he has stolen my papers and validate the 2nd agreement as iam having witness. 5 as my father did not get share in 1st agreement is it valid 6. If my brother claim1.5 acre (in his name)and father claim 2 acrez (in his name/purchased jointly). Can i claim 2.5 acres (ancetral property in my name)that it is my self proprty.