Sale of agri land my share to outsider & not to blood relative.

Hi, Everybody and Good evening. 1. Me & my brother having agri land of 8 acre. My uncle having two sons and also having 8 acre land. Total three sr. No 802, 803 and 804. 2. Ser. no 802 total land is 6 acre we both are having 3-3 acre. (No name of uncle in this sr.no) 3. Sr. No 804 of 5 acre belongs to uncle (No name of our in this sr.No. 4. Sr. No 803 is 5 acre, Me and my brother 1-1 acre on our name and 3 acre on uncle's name. Thus brother having 4 acre, myself 4 acre and uncle having 8 acre. 5. Three years back I sold 3 acre land from Sr. No 802. Balance on my brothers name. Today he want to sell his 3 acre to outsider person because he offering handsome money. (Say outsider 100 rupees in one time & Uncle's son want this 3 acre with 60-70 rupees & amount will be paid in two years. 6. Now days from Sr. No 803 1 acre land sold to uncle's son few months back (2 months) he given good amount. SO MY PROPERTY OF 4 acres Finshied. Same time(1.5 Months back) my brother sold total 4 acre to outsider because of amount difference. NOW UNCLE & SON FILED CASE AGAINST BROTHER AND THE OUTSIDE PERSONS. WE ARE WORKING OUTSIDE AND DON'T WANT FIGHT WITH THEM. CAN YOU SUGGEST BETTER SOLUTION OR WAY FORWARD PLEASE. WAITING EAGERLY FOR YOUR SUGGESTION. (In uncle's mind one thing filled that " first priority to buy this priority and afterwards outsider. is it true? What basis he filed case. Regards, Dhananjay