Statement: Shyam is not the father of Hari. Hari is the son of Suresh. Suresh has three sons.
Conclusions:
I. Hari is the brother of Shyam.
II. Suresh is the father of Hari.
If only conclusion II follows
Conclusion I is invalid conclusion as relation between Hari and Shyam is not given. Conclusion II is valid because if Hari is the son of Suresh, then Suresh will definitely be the father of Hari.