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Dear Sir,
As per your query, the land is clearly demarcated by the government survey records and boundary is marked by stone. Besides each land has two separate sale deeds.
Further, as per your statement it reveals that the property in question is a self acquired property then what you mean by you have made a settlement agreement with respect to your property for your son. What made you to make a settlement deed and that too among whom you made the settlement deed? Once it is a self acquired property and title deed is in your name, then it is your prerogative that to whom you want to give said property?
Anyway, now you say that your son is the registered owner of the land which was in your name then who stops you to do the mutation in his name? Get the mutation done and ask him to apply to conduct survey of his registered property and get demarcate your total 25 cents for which he is paying the land tax so that the encroached area by your step daughter may be recovered by some other portion of her. Visit Tahsildar’s office and ask for an application form (it must be form No.10 ) and submit it to the respective office along with the documents required. After receiving your application, a Tehsildar will check it for further approval and all the properties around your property will be measured and demarcated for you. In that case definitely the property of your step daughter will be more and further the wall will have to demolished. Amicable settlement will be the efficacious remedy for both of you otherwise it will lead to prolonged civil suit. It applicable to her also. So proceed with your remedies so that she is compeled her for settlement.
Now the question is about the approaching way? Whether the way is mentioned in the titled deed for both the properties?
As per your query you are currently not staying there. If there is a gate at the entrance of your property then offload two lorry cow dung inside the compound and infront of the gate by JCB on Sunday for the time being. Do it swiftly. who stops you. While doing this your son should not be in the city. Do it yourself. It is your property. Rainy season is best for it. You can also adopt the same measures which she adopts. You also keep a voracious dog to avoid tress pass by anyone in your property? For time being Don’t tell anywhere that your step daughter was using the way over a period of 30 years.
Since it is a civil matter police has no role in this case.
For nuisance by the dogs of your step daughter file a criminal complaint u/s 425 and 289 IPC.
Install CCTV at your premises as there exist every chance that she may file false criminal case against you and your son.
Further you said that the house is registered in your name and in your step daughter name? What does it mean? Ask for your share by selling it hence it cannot be divided in metes and bounds. Your query needs more clarification then only can answer it properly. Thank you.