Eviction of place given out of love and affection

A person staying at a premises without paying any rent is a gratuitous licensee and no tenancy rights are evolved unto him. You don't owe him anything. He can be legally evicted. Period of occupation doesn't give him any legal rights. 

Ask him to vacate it or send him a legal notice for eviction.

You can instruct him to vacate immediately.

He cannot claim tenancy rights since there is no landlord tenant relationship, it was only a care taking arrangements hence neither he can claim compensation nor you are obliged to pay him any to evict him.

Issue legal notice to the occupants to hand over peaceful vacant possession within a month or so, failing which file a suit for possession through a local prudent lawyer.

Yes, being a gratutous occupant he has right or interest in the property. 

He has right in the property or he has no right in the property? Please reconfirm.

The gratuitous person, as the meaning suggests,  cannot claim any rights over the property because he is neither a licensee nor a tenant so that he can claim tenancy rights, nor he is a legal heir of the owner nor it is an ancestral property to him, hence you do not have to show him any mercy and strictly warn him to vacate or he will be ejected from the property by filing a civil suit for ejectment.