1.NO. Your uncle cannot force your father to sell his share of the property or construct a wall.
2. To settle the matter, you can file suit for partition, wherein the Court will partition the property between your father and uncle.
3. After partition, your father has full rights over his share.
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As per your submission it reveals that this is a matter of your uncle forcing to sale thehouse which is in name of your father
Your uncle can't force to your father to sale as per law
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