Khadija (rad) said, “By Allah, Allah will never disgrace you, for by Allah,
(1) you keep good relations with your Kith and kin,
(2) speak the truth,
(3) help the poor and the needy,
(4) entertain your guests generously and
(5) assist those who are stricken with calamities.”
(Bukhari 4953)
Among all the traits why did Khadija (rad) mention having good relations with kith and kin first?
It’s not difficult to be good to someone who is a stranger. When seeing a stranger in distress, one will help him or her.
But with relatives due to constant dealings. An individual may at times come across both soft and harsh temperaments. One will hear both good and bad. Recollecting their harsh temperament will prevent one from treating them with excellent character.
This is why Khadija (rad) mentioned this trait of the Prophet


How can Allah abandon you when you keep good relations with your relatives?
This establishes the principle that someone who treats their relatives well will also treat others with kindness.