That could be your daughter. It could also be someone with no blood relationship to you if it is actually your brother-in-law's niece. It could also be your niece and in most families you would just refer to her as a niece.
niece
In order to answer a question, it needs to make sense! That would help...
The great aunt is the great niece's baby's great-great aunt.
Yes, she is the daughter of a brother/ sister.
A daughter of a brother or sister(whole family) further ones.
Your niece's child and your grandson's child (your great grandchild) are second cousins, once removed, to each other.
He will be your .father or father in law depending on which side of the family
She would be your niece. and you would be her uncle.
This case can specifically be settled by the family
Since this is your mom's partner's niece, she is a part of your family. The best thing would be for you to view her as family so there is no problem in the family. If you all like each other like family and find other people to be intimate with, your mom and partner would have a easier time with all of you.
Ashlee Braxton is the niece of singer Toni Braxton. Ashlee turned 22 in September of 2013 and can be seen on the show "Braxton Family Values."
Well, she is his niece so yes. They're family, what do you think?