Who exactly are the people who fall under the ruling of kinship ties (al-arham), and does "severer" in the hadith: "A severer shall not enter Paradise" refer to someone who severs ties with all their kin, or with just one person among them, and what is the duration that is considered severance of kinship ties?

The true meaning of kinship that must be upheld and the sayings of scholars regarding it have been previously explained. This ruling is general for all kin; upholding ties with each of them is obligatory, and severing ties with them is forbidden. The Sharia has not specified how kinship ties should be maintained or for how long; the prevailing custom is the reference point for this.