How am I related to my Brother's Daughter's Son and what do I call him (ie cousin, nephew, etc.) Also, is that changed in any way if the Daughter is adopted. I am assumed it does not change as it should not matter. I do need an expert answer, though. Thank you.

The son of your brother's daughter is your great-nephew, since the daughter your brother adopted is legally your niece, her child is legally your great-nephew, but it gets all convoluted so I'd just have him call you aunt. :P

Charoltte is correct. I call my aunt "Auntie" . She is my son's great-aunt... so great he calls her "Super Auntie". How cute!

Awesome. Thanks for such a fast answer as I needed it so I could sign a birthday card!

Welcome!

How am I related to my son in law,s half sister,s family