Bukhari

Hadith Commentary:
It is clearly evident from this chapter that the one who severs the ties of kinship is considered as one who breaks his connection with Allah, the Exalted.
Many so-called pious Imams completely disassociate themselves from their sinful brothers and regard this as piety.
This is an entirely false notion.

Hadith Commentary:
(1)
From these ahadith, the importance of maintaining family ties (silat ar-rahm) becomes evident: Allah, exalted is He, maintains His connection with the one who maintains family ties, and He severs His connection with the one who severs them. In the present era, many religiously observant people completely cut off relations with their worldly-minded brothers, and consider this to be the highest standard of piety. This is a completely mistaken notion. Such people should reconsider their conduct. In the Noble Qur’an, the condemnation of severing family ties is expressed in these words: “And those who sever what Allah has commanded to be joined.” (: ar-Ra’d 13:25) In reality, there are several levels of kinship: the first is that there is such a relationship between people that mutual marriage is prohibited; the second is that they inherit from one another; the third is that, apart from these two, there is kinship for any other reason. Among these, the greatest right belongs to the mother, then the father, and then, according to their rank, other relatives.

(2)
Although maintaining family ties is the right of all relatives, this right increases according to their degree of closeness. The minimum level of maintaining family ties is that mutual greetings and conversation continue. If even this does not remain, then what kind of family ties are left? After this, inquiring about the condition of relatives, supporting them with wealth and life, overlooking their mistakes, and protecting their honor and dignity—these are all various forms of maintaining family ties. And Allah knows best.