1. If he is continuously threatening, then you can very well file a suit for permanent injunction to restrain him from posing threats to grab your lands or for forcing you to give away your land to him.

If he is not allowing you to have road access from your property you can file a suit for easement rights claiming claiming pathway for ingress and egress purpose.

2. The unregistered partition is not legally val;id, however since the 5 guntas property was transferred to him by a registered deed, you cannot claim it.

Total land of family is 10 acres but you got 4 acres and uncle got 6 acres through partition . Challenge the  partition seeking equal share of five acres from uncle. This will put the  unlce on defensive. You can also seek partition  of house that has gone to uncle. He has no right  to block your access. When ancestral land is partitioned every sharer get right  to access his share through the  share of other sharer under law of easement.

1. File a suit for partition seeking equal share in land and house. In the  suit seek injunction against blocking your access.
2. Father has no right to transfer all 5 Guntas. He can only deal with share which  is 2.5 Guntas. Seek recovery of 2.5 Guntas  from uncle.
3. If properly framed and pursued you have absolute chance of getting equal share in land and property and return of 2.5 Guntas. But suit being partition it will take long time for final disposal.  

Yes you can first issue a strict legal notice through lawyer and thereafter take legal steps to approach court depending on the situation 

• Your father’s ownership is secure.
• Your uncle cannot block road access; court will protect your easement.
• His claim for “more land” will not succeed.
• Recovery of 5 guntas given in 2018 is possible only if you prove coercion, otherwise difficult.
• Best remedy: legal notice + injunction suit to stop threats and secure your rights.

Uncle cannot block road access as you have easement art right if necessity if there is no other access to your land 

2) you can file case before he does 

3) seek orders  to set aside 5 guntas  of land 

4) you have good case on merits 

Dear Sir,

Yes, you absolutely can and should file first:

• Civil suit for permanent injunction restraining him from blocking road access and from interfering in your peaceful possession.

• Along with this, apply for temporary injunction (Order 39, CPC) so the court prevents him immediately while the case goes on.

• You can also send a legal notice (through advocate) highlighting harassment and threats. This will “soften” him and also serve as evidence if case proceeds.

• Practical chances

  • Right of access → Very high chance you will win.

  • Getting back 5 guntas gifted in 2018 → Possible, but will depend on proving undue influence or lack of authority.

  • Uncle claiming more land → Very low chance of success.

  • Blocking access → If he does, you can even seek mandatory injunction directing him to keep road open.

  
  

1. Yes, you can file a case against him 

- You can send him a legal notice, and if no response, then file a suit against your uncle under The Indian Easement act ,  for claiming path to your land. .

.2. Under section 35 of the Indian Easement Act , you can obtain permanent injunction restraining your uncle from obstructing your right to access.

Based on the facts, your uncle cannot legally block access to your father's land or force you to accept his demands. If your father's 4 acres can ONLY be accessed via your uncle’s land, you have the right to an easement of necessity: the right to access and use a passage for ingress/egress, which cannot be lawfully blocked. The Indian Easements Act specifically protects this right, and courts routinely grant injunctions preventing co-owners from obstructing essential access.An unregistered partition deed is typically not valid to transfer or define legal title, but if it served as a family arrangement and everyone acted upon it, courts may consider it as evidence of the intention, especially if supported by subsequent registered deeds and actual possession. The registered gift deeds from your grandmother carry the strongest legal weight, and unless your uncle can prove fraud, coercion, or that he gave significant monetary consideration (which is not usually given legal credence against a registered deed), his oral claim that he "purchased" the land is not binding.On retrieving the 5 gunta given away in 2018: If it was transferred by a registered deed from your grandfather (who had title at the time), undoing it may be possible only if you can prove fraud, lack of free will, or that your father’s consent was forcibly extracted. If the deed contradicts a prior registered partition, you may need to challenge it in court—but the burden of proof is high.You can and should:Send a legal notice to your uncle documenting all threats and harassment; mention Section 503 IPC (criminal intimidation).File a police complaint if threats persist or if he blocks access, and seek a permanent injunction in civil court against his interference.File a suit for easementary/access rights if he blocks your road, seeking immediate interim relief.File for partition or declaratory relief if boundary or ownership disputes escalate.He cannot win a case for "more" land unless he proves a valid legal claim and overcomes the presumption created by existing registered deeds and actual possession. Repeated harassment can also be addressed through civil restraining orders or police action.Filing a civil suit or sending a firm legal notice is likely to restrain his conduct and assert your rights. Courts favor the lawfully documented owner and will uphold access rights and clear records over oral or coercive demands

Immediately issue a legal notice and then file a civil injunction + easementary rights suit. This will stop his threats legally and protect your land’s value. Don’t wait for him to act first.

1. The legal notice to your uncle or a money suit to recover the money given on behalf of the buyer even before the sale is completed will not be binding on your uncle and it will not be considered as legally liable debt. The unregistered agreement cannot be enforced in law.

If your uncle is not cooperating then you don't involve him in the sale of property.

Moreover the buyer is your uncle's friend hence there's a possibility of collusion between both, therefore your proposal seems not advisable.

2. You may better produce the related relevant papers before a prudent lawyer in the local and proceed as suggested.

Once agreement is signed it is binding upon parties 

refuse to pay  any money before registration .it is for buyer to pay uncle 

it is necessary to peruse terms of agreement for sale signed by your father and uncle whether agreement can be terminated or not 

You are not legally bound to pay your uncle ₹30 lakhs if it is not part of the written sale agreement. Instead, you can issue him a legal notice warning against obstruction and insisting on completing the sale as per the agreement. Sending such notice will not harm the sale legally, though practically it may strain relations since the buyer is his friend.

If your uncle refuses to register, the buyer may not proceed. If you want to withdraw from the sale, you can return the advance, but the buyer has the right to sue for specific performance (forcing you to complete the sale) or claim damages for breach of agreement, depending on the terms in the agreement.

You need to make good any loss to the other party as per terms of agreement 

1. Yes, your father can refuse to pay the said amount , and send a legal notice , and as the said agreement is not registered then he cannot take any legal action 

2. Only if you have receive a part of the selling amount then only the purchaser can approach Court