Have you noticed when you meet a particular brother or sister for the first time, you get along with them instantly. You agree on most things, you feel comfortable in their presence and most importantly you talk to them as if you have known them for years.

You even express yourself in a way that would take you months or even years with other people. You don't hold back what you want to say and can express yourself freely in their presence.

After meeting them a few times you have a firm attachment to them and proudly proclaim them to be your brother or sister.

The Prophet (sallallahu alayhi wasallam) described why this happens.

A'isha (radiallahu anha) narrated that the Prophet (sallallahu alayhi wasallam) said: “Souls are troops collected together and those who got along with one another (in the realm where souls existed before entering physical bodies in this world)

will have an affinity with one another and get along (in this world)."
(Bukhari, 3158; Muslim, 2638)

So the brothers and sisters that you love and cherish in this world are with you for a reason.