Property dispute

You as one of the legal heirs of your deceased father is entitled to a share out of your father's share in the property as a right.

Your siblings and your mother are also entitled to their legitimate share in the property as a right.

If they are not coming for an amicable settlement, yo can approach court of law with a suit for partition to divide the property by metes and bounds and by good and bad soil with separate possession of your share.

How long would this case take to be over...we have been trying to negotiate from past 25 years it almost looks impossible and now they have started using unfair means to get our signature and documents

 Is it possible to get favourable decision from filing a suit on this property?

Yes, your  siblings  and your mother are entitled to get  share in the property bought by your father and his brother jointly. If your uncle is not ready to settle the issue,you should approach the  Court for partition of property.case will be decided within two or three years.

You had travelled over 25 years without any solution and in fact this problem has aggravated now 

Therefore, instead of more delay, you may initiate proper legal action against them at least now and immediately.

The legal process may fetch you the desired relief within couple of years.