Angaran Culture/Family

So, I just want a bit of clarification/theorising on Angara family structures. 

A lot of angry people are claiming it seems to be a harem sort of thing, where one male has many wives and thus, many children with them, like a lion. This seems to be encouraged by the story Jaal tells you in the email, where the child did not heed the warnings of their father or mothers. 

But tbh, I think it's more like a clan sort of thing, with a patriarch, one male, as the 'head' or 'father' of the family. When Jaal talks about his first love, he later goes on to say she became one of the mothers [of his family]. To me, this seems to suggest that Angaran 'share' mothers but not fathers. So when a female Angara has children, she becomes a 'mother' to her family, and she will help care for and raise the others children. 

So what about brothers, sisters and cousins then? How do we differentiate with that? 

There could also be aspects of poly relationships within Angaran culture. Where a female or male Angaran may have more then one mate or partner at any given time, but this is more just theorising why Jaal may have many brothers or sisters (half siblings). Unless Angara have... litters or something. 

Just my thoughts.