Your half-brother's daughter is your niece. Your niece and your son are first cousins to each other.
your uncles daughter would be your cousin
you would be her aunt and she would be your niece
Since your uncle's sister is your aunt, her daughter would be your cousin, just as your uncle's daughter would be.
It would be a second cousin.
She would be your 2nd cousin.
The relation of the mother;s sister to daughter is niece-aunts.
Being your sister's brother or sister you would be an uncle or an aunt to her daughter.
That would be second cousin once removed. Your parent and your grandmother's sisters daughter were first cousins. You and the daughter's daughter are second cousins. There is a difference on one generation between the two of you.
If she's not your mother, that would make her your Aunt.
I think the kids would be second cousins
You are one generation out of synch. That would make you first cousins once removed.
she would be your half-sister (since she shares half your blood)