Ownership rights on land can be acquired by succession, survivorship, inheritance, partition and purchase. Disputes can arise out of objections about validity of rights of owner/seller or eligibility of purchaser and breach of government rules and regulations to hold the land. The manner in which these disputes are dealt with, is very specific to the facts of each case and needs specialized domain knowledge. It is important to consult a lawyer before taking any steps towards litigation. There are ways to check buyer and seller eligibility in a transaction of sale of immovable property. More information on how to check the eligibility is available here