Numerous reports (Rawayaat) testify that Sileh Rahmi (kindness to one's relatives) also has worldly benefits. Like, increase in the life-span, postponement of death, increase in the number of descendants etc., Hazrat Imam Ja'far as-Sadiq (a.s.) related three traditions from the Holy Prophet (s.a.w.s.) in the court of Mansur Dawaniqi (l.a.).
1) "A man who has only three years of life remaining, performs an act of kindness to his relatives and Allah increases his life by thirty years. In the same way a man has thirty years of life but due to his breaking off the ties of relationship, his (remaining) life is decreased to three years. Then the Holy Prophet (s.a.w.s.) said: Whatever Allah wills He erases and whatever He wills He writes.
It means that if Allah wills He can alter (certain destinies) due to one's actions and deeds."
(Behaarul Anwaar)
2) "Fulfilling the rights of kith and kin increases the life-span even if the relative is a sinner."
(Behaarul Anwaar)
3) Sileh Rahmi (kindness to relatives) is a cause for the easy accounting of one's deeds on the day of Qiyamat and it (Sileh Rahmi) protects one from sudden death."
Hazrat Imam Ja'far as-Sadiq (a.s.) has told Maysar:
(O' Maysar) the time of your death has arrived many times but Allah has postponed (your death) due to your kindness to the relatives and good behaviour towards them.
'Sileh Rahmi' Prolongs Life
It is reported from Imam Ja'far as-Sadiq (a.s.) that he said to Maysar,
"O Maysar, truly your lifespan has increased, what good actions have you been performing?"
Maysar replied, "In my youth I used to earn from my labours an amount of five Dinars a day and I used to give these to my maternal uncle."
Yaqoob Magribi was once in the presence of Imam Musa al-Kazim (a.s.). Imam (a.s.) said,
"You and your brother had an argument over the ownership of a house. So much so that you abused each other and broke up the ties of relationsip. Such a thing is not from my religion, neither is it from the religion of my ancestors. Then fear Allah , the One Who is without any partner. Fear the Divine Punishment. Due to this sin, death shall soon separate you (two). Your brother will die in this journey and you shall regret you actions."
The man asked,"May my life be sacrificed upon you, when will I die?"
Imam (a.s.) replied,
"Your death had also arrived but you did an act of kindness to your father's sister (your aunt) and thus your lifespan increased by twenty years (or months)."
As Imam (a.s.) has predicted, Yaqoob's brother died before he could reach home and was buried on the way.
(Safinatul Behaar)
The Benefits of Sileh Rahmi in the Hereafter
The practice of Sileh Rahmi (kindness to kith and kin) accrues worldly advantages, spiritual benefits and bounties of the Hereafter.
Imam Ja'far as-Sadiq says:
"Sileh Rahmi perfects the morals and encourages charity. When one performs Sileh Rahmi he has to be benevolent towards his relatives. The continuous practice of Sileh Rahmi brings refinement in his morals. In the same way repeated acts of kindness inculcate a benign and compassionate feeling in the person, and the soul is purified (from the sin of jealousy and enmity).
(Safinatun Behaar)
Sileh Rahmi Causes All the Good Deeds to be Accepted
Imam Muhammad al-Baqir (a.s.) states:
Sileh Rahmi (kindness to relatives) purifies deeds. Purification of deeds means, that the shortcomings in all the good deeds of a person practicing Sileh Rahmi are naturally compensated and all his good deeds are accepted by Allah.
It increases wealth, wards off difficulties and calamities. The accounting of your actions on the day of Qiyamat is made easy. Even the ordained time of death is postponed.
Extending Hand of Friendship Towards Those Who Want to Break the Ties (Qat-e-Rahem)
Imam Sajjad (a.s.) says:
There are two actions, towards which, a step taken is liked by Allah more than anything else. One is the step taken to join a row formed in the name of Allah (for Jehad or Namaz); the second is the one taken to extend a hand of friendship towards kith and kin who want to break relations.
(Behaarul Anwaar)
The Holy Prophet (s.a.w.s.) said:
"Certainly there is a section in Paradise which can not be attained except by three kinds of people. First the just Imam, second, the one who does Sileh Rahmi, and third the one who has family (and children) but remains patient (in poverty and difficulties).
(Behaarul Anwaar)
The Reward of Sileh Rahmi
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)
source : GREATER SINS by Ayatullah-ul-Uzma Sayed Abdul Husain Dastghaib Shirazi (r.a.)