Because it just is! At the core, every word is an arbitrary collection of sounds that has been given a meaning agreed to by a group of people.
The word cousin comes to English by way of Old French from the Latin word consorbrinus - meaning the child of a maternal aunt.
There is no relation that is properly called a step cousin.
It was called The War of The Roses or The Cousins War because the House of Lancaster and the House of York were actually related by blood to a previous King, both houses thought that they had the right to the throne.
No, there is no term in the English language for this occurrence.
Yes everybody has cousins.
If two people are first cousins, the children of one are second cousins to the children of the other.
Second cousins
One of her cousins are called Ellie Cosgrove.
The Cornish Cousins
Your uncle or aunt's children are called your cousins.
To your mother, they are first cousins once removed. To you they are second cousins.
One of his cousins are Donald Dwight
Louis doesn't have any cousins.
Cousins are the children of of both your parent's siblings (your aunts or uncles.)
GOPHER
They are your cousins.
emir
Cousins