what I understand about kinship networks is that they are a web of relationship between family members and close friends but it can get much more than that. I was raised and taught that I should always smile and be friendly to other people as we don't know what is happening in their life, people may be going through a lot in their life and your act of being friendly to them might make their day. when I was still living with my parents I knew that when I woke up I had to greet every one with a smile and ask how was their night and for that I would get a sit in the breakfast table with all kinds of food , in my family it was unacceptable to bring bad mood to the breakfast table.
I grew up with that mentality for example I'd often wash my brothers car so that he can help me with my home works on the weekends . Years later I worked in my grandfathers supermarket for free because they said I was family and they cant afford to pay the workers and me also but I didn't mind because helping my grandfather was always fun, I didn't mind because I knew that in that exchange I was offering my grandfather my services or help and I was also gaining experience .
Culture and religion also plays an important role in kinship and network exchange for example in my culture we have lobola, lobola is where the groom's family makes a payment to the Bride's family it can be in a form of money or livestock it is believed that lobola is some kind of a seal that will bond the family together and bring blessings. This lobola process can also be viewed as a network exchange because it involves the exchange of lobola for a bride.