niece/nephew
u call your dads brother uncle in English
Hes now relation to you really. You dads sister would be your auntie You aunties daughter would be your cousin I think you could call him cousin in law but im not sure Yes, you can call it cousin in Law.
No relation
He had a half brother from his dads previous marrige.
There his dads... Totally legit story.
Brother in law
brother
Brother-in-law
Your brother or brother in law
Step uncle
your brother's daughter is you niece
your brother