If your mother's cousin is her first cousin (if one of each of their parents were siblings) then that cousin is your 'first cousin once removed'.
If that cousin has any children, they are your second cousins.
you call your mums cousin a 2nd cousin, because your mums cousin is her 1st cousin, wich makes your mums cousin your 2nd cousin.
Your cousin's cousin could either be your cousin or no relation at all.
He is of relation as a cousin-in-law.
Well, your cousin's brother is also your cousin, and a cousin's son is also your cousin.
Your mother's aunt's is your mums first cousin and your first cousin, once removed.
Your cousin. You are that person's second cousin.
Second cousin
They are your cousin-in-law.
Cousin in Law
Your cousin-in-law.
still your cousin
Your Aunt's first cousin may be your second cousin, onve removed or may be no relation to you at all.