Sileh Rahmi has been described by the Holy Prophet

The reward for Sileh Rahmi has been described by the Holy Prophet (s.a.w.s.) in one of his traditions. He says:
"When a person goes towards his relatives so that he can fulfill his rights with his life and his wealth, Allah bestows upon him the reward of a martyr at every step he takes. He (Allah) writes down forty thousand Hasana (the unit of Divine rewards) and He erases forty thousand of his sins and He elevates him by forty thousand grades. The person achieves the position of one who has worshipped Allah for a hundred years."
(Behaarul Anwaar)

At another place the Holy Prophet (s.a.w.s.) says, regarding the rewards for Sileh Rahmi:
"The reward for Sadaqah in the way of Allah is ten times, whereas the reward for giving a loan is twelve times (because in giving a loan the dignity of the Loanee is maintained). The reward for the good behaviour to the believing brothers is twelve times and the reward for Sileh Rahmi is twenty four times." 
(Behaarul Anwaar)

The Meaning of Sileh Rahmi and Qat-e-Rahmi

The Shariat of Islam has not provided any fixed definition for these two terms. In this case the meaning as judged by common sense and reason must be accepted. We must consider all the relatives from the father's side and mother's side, irrespective of whether they are close or distant, to be our kith and kin who have a right on us. In the same way the children of the daughters and their descendant also come in this category as the Quran says: 
'Those who join together (do Sileh Rahmi) those things which Allah has commanded to be joined."
(Surah Raad 13:21)

Urwah Ibne-Yazeed asked Imam Ja'far as-Sadiq (a.s.) the meaning of this Ayat (Surah Raad 13:21), the Imam (a.s.) replied;
"You have been commanded to do Sileh Rahmi towards all your relatives. Whether they are Mehram (in the prohibited category of marriage) or Namehram, (not in the prohibited category) whether they are distant relatives or closely related, whether they are immediate relatives or separated by several generations." 
(Al Kafi)

No Discrimination Between the Affluent and the Poor Relatives

It is generally observed that people tend to behave graciously towards their wealthy relatives and avoid the poor ones. The faith of Islam does not differentiate or discriminate between the rich and the poor relatives. What is important is the closeness of relationship. The more closely a person is related to you, the more important and necessary it is to fulfill his rights.

What is Sileh Rahmi?

Any behaviour which is generally regarded by people as good, kind, gracious or obligatory, when directed towards your relatives is Sileh Rahmi.

Imam Ja'far as-Sadiq (a.s.) says:
"The kindness towards relative and goodness towards the believing brother makes easy your reckoning on the Day of Judgement and protects you from sins. So you should be kind to your relatives and be good to your believing brothers even if it is as little as a sincere 'salaam' (salutation) or a hearty reply to a salaam." 
(Al Kafi)

At another place the Sixth Imam (a.s.) remarks:
"Do Sileh Rahmi towards your relatives and the near ones even if it is just by offering a glass of water to them." 
(Wasaelush Shia)

The Different Grades of Sileh Rahmi

Shaheed-e-Thani1 (r.a.) describes the grades of Sileh Rahmi in the following words:
It is deduced from the traditions that the highest stage of Sileh Rahmi is to consider the relatives as our own selves. That is, we should wish for our relations whatever we wish for ourselves.

The next stage of Sileh Rahmi is to help relatives overcome the difficulties and hardships they may be facing. Next, we must earnestly try to benefit our kith and kin as much as possible, in areas where they need help and of course in a manner permitted by religion. This benefit can be either economic or by way of making a person independent, by securing for him a job or initiating him into a trade. It can also be in the form of a sound advice, spiritual guidance and religious teachings.

The fourth stage of Sileh Rahmi is towards those people who are dependents of our relatives. For example, the brother's wife or the step-mother.

The simplest kind of Sileh Rahmi consists of salutations, a lesser kind is the conveying of Salaam (through someone). The smallest kind of Sileh Rahmi is to pray for relatives in their presence and to encourage them.