'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)