1) k hata consists of all the details of property –the name of the owner, size of the buildings, location of property and other details that help to file property tax.
2) Khata transfer is done either for reason of sale of property, gift, will, or a death of property owner and such cases.
3) if Mr A had sold or gifted the property to his brothers then Mr B and C would be absolute owners of property
4) Mr X title would be clear
5) it is better you get the title documents vetted by local lawyer before purchase of the property