1- Oral notice has no validity in the eye of law for the purpose of eviction. The notice for eviction should be in writing under T.P.Act.
2- There is no Agreement neither rent receipts, although claim existed as tenant in the property in dispute. So far this your friend can claim for adverse possession holder. After lapse of about 13 years.
3- Now tell me one thing whether the land lord refused to receive the rent or not. If he is still continuing in receiving the rent in this condition, landlord can not evict your friend from the disputed premises under the law.
4- Tell me one thing more from where this matter is arising. Give me district and State in India also.
5- The eviction of your friend can be only in accordance with the rent law. Otherwise landlord has no option to eviction.
6- If landlord taken ground of personal use. Then in this circumstances you have to enquire about the present status of landlord in detail . And after going through entire case I can put my opinion that what should be or not.