Tenant died

You are well aware qua legal position on the subject  which you have already quoted in your post, what else do you intend to ask ?

If reasonable requirement is required to be proved in this situation then i think that the ‘5 years provision and thereafter preference to the legal heirs’ is redundant and a flaw in the tenancy act because tenancy would become heritable .Reasonable requirement ground or other grounds of eviction as well claiming fair rent was already applicable when the tenant was alive and would similarly be applicable to her legal heirs as well.Then on the death of a residential tenant there would be no relief to the landlord in true sense.

You can seek eviction based on the grounds provided under Section 6 of the Act.

To understand the complete procedure of tenant eviction, you might want to take a look at this- Tenant Eviction India. This helped my colleague. Might help you too!

I don't want to make any fresh agreement with the sons of the deceased once the 5 year period is over. So how can I evict them?