The duty of maintaining ties of kinship

Kulayb ibn Manfa’a reported that his grandfather asked, “Messenger of Allah, towards whom should I be dutiful?” He replied, “Your mother, your father, your sister and your brother. Then your mawla (client) has the next right against you and then your relatives who are connected.”
(Al-Adab Al-Mufrad 47 )
@Atiq Alulama