Related characteristics?

I have observed many bgr relationships and have seen that each of them do in fact resemble each other's relatives..

For example Girl A is similar to the Guy A's sister whether appearance or personality wise.

For Sam and I,  I see that he has many characteristics of my dad and brother, and maybe even my mum. He also looks like a part of my mum's family, closest match is my 9 Uncle.

Interesting ne? [which btw is my blog address hehe]