Your dad's cousin would be your cousin, once removed. The 'once removed' means that there is a generation difference between you and your dad's cousin. Your granddad's cousin would be your cousin, twice removed. The 'twice removed' means there are two generations difference between you and your granddad's cousin.
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.
There is 2 answers your mothers brothers children or your dads sister;"s children
He would be your second cousin.
It would be a second cousin.
She would be your 2nd cousin.
The relation of the mother;s sister to daughter is niece-aunts.
You are not related to your cousin's husband. He would simply be "My cousin's husband."
First cousin, once removed. Second cousin
2nd cousin
Your cousin's cousin could either be your cousin or no relation at all.
it's like your 3rd cousin
Your father's first cousin's son is your second cousin. Your father's second cousin's son is your third cousin. If your are asking about your fathers cousins who are in a removed cousin relationship to your father, their relationship to you be more complex, with two different possibilities in each case.